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2D Structure
Also known as: 154-93-8, 1,3-bis(2-chloroethyl)-1-nitrosourea, Bcnu, Gliadel, Carmubris, Carmustin
Molecular Formula
C5H9Cl2N3O2
Molecular Weight
214.05  g/mol
InChI Key
DLGOEMSEDOSKAD-UHFFFAOYSA-N
FDA UNII
U68WG3173Y

A cell-cycle phase nonspecific alkylating antineoplastic agent. It is used in the treatment of brain tumors and various other malignant neoplasms. (From Martindale, The Extra Pharmacopoeia, 30th ed, p462) This substance may reasonably be anticipated to be a carcinogen according to the Fourth Annual Report on Carcinogens (NTP 85-002, 1985). (From Merck Index, 11th ed)
Carmustine is an Alkylating Drug. The mechanism of action of carmustine is as an Alkylating Activity.
1 2D Structure

2D Structure

2 Identification
2.1 Computed Descriptors
2.1.1 IUPAC Name
1,3-bis(2-chloroethyl)-1-nitrosourea
2.1.2 InChI
InChI=1S/C5H9Cl2N3O2/c6-1-3-8-5(11)10(9-12)4-2-7/h1-4H2,(H,8,11)
2.1.3 InChI Key
DLGOEMSEDOSKAD-UHFFFAOYSA-N
2.1.4 Canonical SMILES
C(CCl)NC(=O)N(CCCl)N=O
2.2 Other Identifiers
2.2.1 UNII
U68WG3173Y
2.3 Synonyms
2.3.1 MeSH Synonyms

1. 1,3-bis(2-chloroethyl)-1-nitrosourea

2. Bcnu

3. Bicnu

4. Fivb

5. N,n'-bis(2-chloroethyl)-n-nitrosourea

6. Nitrumon

2.3.2 Depositor-Supplied Synonyms

1. 154-93-8

2. 1,3-bis(2-chloroethyl)-1-nitrosourea

3. Bcnu

4. Gliadel

5. Carmubris

6. Carmustin

7. Nitrumon

8. Bicnu

9. Becenun

10. Bischloroethyl Nitrosourea

11. Bi Cnu

12. Carmustinum

13. 1,3-bis(2-chloroethyl)nitrosourea

14. Bischlorethylnitrosurea

15. N,n'-bis(2-chloroethyl)-n-nitrosourea

16. Bischlorethylnitrosourea

17. Carmustina

18. Urea, N,n'-bis(2-chloroethyl)-n-nitroso-

19. Nsc-409962

20. Bis(2-chloroethyl)nitrosourea

21. Fda 0345

22. Sri 1720

23. Bicnu (tn)

24. Dti 015

25. Nci-c04773

26. Sk 27702

27. Carmustine (98%)

28. Bis(chloroethyl)nitrosourea

29. Nsc 409962

30. Bis-chloroethylnitrosourea

31. Nsc409962

32. Chembl513

33. 1,3-bis(2-chloroethyl)-1-nitroso-urea

34. Chebi:3423

35. Urea, 1,3-bis(2-chloroethyl)-1-nitroso-

36. Becenum

37. Dti-015

38. U68wg3173y

39. Fda-0345

40. Sri-1720

41. 1,3-bis(2-chloroethyl)-3-nitrosourea

42. Ncgc00015204-05

43. Sk-27702

44. 1,3-bis(.beta.-chloroethyl)-1-nitrosourea

45. Gliadel Wafer

46. Bischloroethylnitrosourea

47. Dsstox_cid_2743

48. Dsstox_rid_76712

49. Carmustinum [inn-latin]

50. Dsstox_gsid_22743

51. Carmustina [inn-spanish]

52. Bis(2-chloroethyl)1-nitrosourea

53. Bis-n,n'-(chloroethyl)nitrosourea

54. Cas-154-93-8

55. Ccris 810

56. 1,3-bis(beta-chloroethyl)-1-nitrosourea

57. Bcnu [chloroethyl Nitrosoureas]

58. Sr-01000075736

59. Einecs 205-838-2

60. Brn 2049744

61. Camustine

62. Carustine

63. Unii-u68wg3173y

64. Ai3-52216

65. Hsdb 7761

66. Bicnu; Nitrumon

67. Carmustine [usan:usp:inn:ban]

68. Carmustine- Bio-x

69. Prestwick_997

70. Gliadel (tn)

71. Bischloroethyl Nitrosourea [chloroethyl Nitrosoureas]

72. Mfcd00057706

73. Gliadel (mgi Pharm)

74. Spectrum_000265

75. Carmustine, >=98%

76. Carmustine [mi]

77. Carmustine [inn]

78. Carmustine [jan]

79. Spectrum4_000888

80. Spectrum5_000920

81. Camustine [vandf]

82. Carmustine [hsdb]

83. Carmustine [usan]

84. Lopac-c-0400

85. Wln: Onn2gvm2g

86. C 0400

87. Carmustine [mart.]

88. Schembl4503

89. Carmustine [usp-rs]

90. Carmustine [who-dd]

91. Lopac0_000188

92. Carmustine (jan/usp/inn)

93. Kbiogr_001296

94. Kbioss_000745

95. Mls001333962

96. Divk1c_000835

97. Amy382

98. Gtpl6800

99. Carmustine [ep Impurity]

100. Carmustine [orange Book]

101. Dtxsid8022743

102. Hms502j17

103. Kbio1_000835

104. Kbio2_000745

105. Kbio2_003313

106. Kbio2_005881

107. Carmustine [ep Monograph]

108. Ninds_000835

109. Carmustine [usp Monograph]

110. Hms2092j22

111. Hms2230i05

112. Hms3260f17

113. Hms3369d17

114. Pharmakon1600-01503110

115. Bcp27690

116. Zinc3830387

117. Tox21_110097

118. Tox21_500188

119. Bdbm50015950

120. Ccg-39925

121. Nsc758392

122. Stk624770

123. Akos005558013

124. Tox21_110097_1

125. Bcp9000490

126. Db00262

127. Lp00188

128. Nsc-758392

129. Sdccgsbi-0050176.p004

130. Idi1_000835

131. Urea,3-bis(2-chloroethyl)-1-nitroso-

132. Bischloroethyl Nitrosourea [iarc]

133. Ncgc00015204-01

134. Ncgc00015204-02

135. Ncgc00015204-03

136. Ncgc00015204-04

137. Ncgc00015204-06

138. Ncgc00015204-07

139. Ncgc00015204-08

140. Ncgc00015204-09

141. Ncgc00015204-18

142. Ncgc00093665-01

143. Ncgc00093665-02

144. Ncgc00093665-03

145. Ncgc00093665-04

146. Ncgc00260873-01

147. Urea,n'-bis(2-chloroethyl)-n-nitroso-

148. Ac-24196

149. As-12106

150. Bc164289

151. Hy-13585

152. N,n''-bis(2-chloroethyl)-n-nitrosourea

153. Nci60_003931

154. Smr000058426

155. Sbi-0050176.p003

156. Eu-0100188

157. Ft-0602937

158. S3669

159. Bcnu; 1,3-bis(2-chloroethyl)-1-nitrosourea

160. C06873

161. D00254

162. Ab00052431-07

163. Ab00052431_08

164. 154c938

165. A809590

166. Q415869

167. Sr-01000075736-1

168. Sr-01000075736-3

169. W-108025

170. Z1563145982

171. Carmustine, United States Pharmacopeia (usp) Reference Standard

172. 1-(2-chloroethyl)-1-([(2-chloroethyl)amino]carbonyl)-2-oxohydrazine #

2.4 Create Date
2005-03-25
3 Chemical and Physical Properties
Molecular Weight 214.05 g/mol
Molecular Formula C5H9Cl2N3O2
XLogP31.5
Hydrogen Bond Donor Count1
Hydrogen Bond Acceptor Count3
Rotatable Bond Count4
Exact Mass213.0071819 g/mol
Monoisotopic Mass213.0071819 g/mol
Topological Polar Surface Area61.8 Ų
Heavy Atom Count12
Formal Charge0
Complexity156
Isotope Atom Count0
Defined Atom Stereocenter Count0
Undefined Atom Stereocenter Count0
Defined Bond Stereocenter Count0
Undefined Bond Stereocenter Count0
Covalently Bonded Unit Count1
4 Drug and Medication Information
4.1 Drug Information
1 of 4  
Drug NameBicnu
PubMed HealthCarmustine
Drug ClassesAntineoplastic Agent
Active IngredientCarmustine
Dosage FormInjectable
RouteInjection
Strength100mg/vial
Market StatusPrescription
CompanyEmcure Pharms

2 of 4  
Drug NameGliadel
PubMed HealthCarmustine
Drug ClassesAntineoplastic Agent
Active IngredientCarmustine
Dosage FormImplant
RouteIntracranial
Strength7.7mg
Market StatusPrescription
CompanyArbor Pharms

3 of 4  
Drug NameBicnu
PubMed HealthCarmustine
Drug ClassesAntineoplastic Agent
Active IngredientCarmustine
Dosage FormInjectable
RouteInjection
Strength100mg/vial
Market StatusPrescription
CompanyEmcure Pharms

4 of 4  
Drug NameGliadel
PubMed HealthCarmustine
Drug ClassesAntineoplastic Agent
Active IngredientCarmustine
Dosage FormImplant
RouteIntracranial
Strength7.7mg
Market StatusPrescription
CompanyArbor Pharms

4.2 Therapeutic Uses

BiCNU is indicated as palliative therapy as a single agent or in established combination therapy with other approved chemotherapeutic agents in the following: Brain tumors-glioblastoma, brainstem glioma, medulloblastoma, astrocytoma, ependymoma, and metastatic brain tumors. Multiple myeloma-in combination with prednisone. Hodgkin's Disease-as secondary therapy in combination with other approved drugs in patients who relapse while being treated with primary therapy, or who fail to respond to primary therapy. Non-Hodgkin's lymphomas-as secondary therapy in combination with other approved drugs for patients who relapse while being treated with primary therapy, or who fail to respond to primary therapy.

US Natl Inst Health; DailyMed. Current Medication Information for BiCNU (carmustine) (October 2007). Available from, as of November 9, 2009: https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?id=5694


bis(Chloroethyl) nitrosourea has been used since 1971 as an antineoplastic agent in the treatment of Hodgkin's lymphoma, multiple myeloma, and primary or metastatic brain tumors.

DHHS/National Toxicology Program; Eleventh Report on Carcinogens: Carmustine (bis(Chloroethyl) nitrosourea) (154-93-8) (January 2005). Available from, as of September 18, 2009: https://ntp.niehs.nih.gov/ntp/roc/eleventh/profiles/s037bcnu.pdf


Reported to have antiviral, antibacterial, and antifungal activity, but no evidence was found that it is currently used for these purposes. Former use.

DHHS/National Toxicology Program; Eleventh Report on Carcinogens: Carmustine (bis(Chloroethyl) nitrosourea) (154-93-8) (January 2005). Available from, as of September 29, 2009: https://ntp.niehs.nih.gov/ntp/roc/eleventh/profiles/s037bcnu.pdf


MEDICATION (VET): A chemotherapeutic protocol using carmustine in combination with vincristine and prednisone was tested in dogs with multicentric malignant lymphosarcoma. Of seven dogs treated, six (85.7%) achieved complete remission. A partial response occurred in one dog. Median survival time was 224 days (mean 386 days), and median duration of remission was 183 days (mean 323 days). Marked neutropenia was observed following carmustine administration. There were no significant alterations in platelets and red blood cell counts during treatment, and no abnormalities attributable to the chemotherapy were found in serum biochemical profiles. Results of this study showed that carmustine is an effective alternative option in the treatment of canine lymphosarcoma.

PMID:15238559 Ricci Lucas SR et al; J Am Anim Hosp Assoc 40 (4): 292-9 (2004)


4.3 Drug Warning

/BOXED WARNING/ WARNING: BiCNU (carmustine for injection) should be administered under the supervision of a qualified physician experienced in the use of cancer chemotherapeutic agents. Bone marrow suppression, notably thrombocytopenia and leukopenia, which may contribute to bleeding and overwhelming infections in an already compromised patient, is the most common and severe of the toxic effects of BiCNU. Since the major toxicity is delayed bone marrow suppression, blood counts should be monitored weekly for at least 6 weeks after a dose. At the recommended dosage, courses of BiCNU should not be given more frequently than every 6 weeks. The bone marrow toxicity of BiCNU is cumulative and therefore dosage adjustment must be considered on the basis of nadir blood counts from prior dose. Pulmonary toxicity from BiCNU appears to be dose related. Patients receiving greater than 1400 mg/sq m cumulative dose are at significantly higher risk than those receiving less. Delayed pulmonary toxicity can occur years after treatment, and can result in death, particularly in patients treated in childhood.

US Natl Inst Health; DailyMed. Current Medication Information for BiCNU (carmustine) (Updated: June 2014). Available from, as of April 24, 2015: https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=be6776fe-7f24-417d-ef08-8830c4eca959


Human systemic effects by parenteral, intravenous, and possibly other routes: nausea or vomiting, reduced white blood cell and blood platelet counts, bone marrow damage, and potentially fatal respiratory system effects, including lung fibrosis, dyspnea, and cyanosis.

Lewis, R.J. Sr. (ed) Sax's Dangerous Properties of Industrial Materials. 11th Edition. Wiley-Interscience, Wiley & Sons, Inc. Hoboken, NJ. 2004., p. 466


In a study of 17 children (aged 1-16 years) receiving carmustine in cumulative doses ranging from 770-1800 mg/sq m combined with cranial radiation therapy for intracranial tumors, 8 children (47%) died of delayed pulmonary fibrosis, including all of those who received initial treatment at less than 5 years of age (5 children). Onset of pulmonary fibrosis has been observed up to 17 years following carmustine therapy. Clinical findings include pulmonary hypoplasia with upper zone contraction on chest radiographs, and an unusual pattern of upper zone fibrosis on thoracic CT scans; no abnormal findings were observed on gallium scans.105 Late onset of reduction in pulmonary function was observed in all long-term survivors in the study. Carmustine-induced pulmonary fibrosis may be slowly progressive and cause death.

American Society of Health System Pharmacists; AHFS Drug Information 2009. Bethesda, MD. (2009), p. 981


Pulmonary toxicity, including acute or delayed onset of pulmonary fibrosis causing death, has occurred in patients receiving systemic carmustine therapy. Pulmonary toxicity characterized by pulmonary infiltrates and/or fibrosis occurring 9 days to 43 months following treatment has been reported in patients receiving carmustine or related nitrosoureas. Most reported cases of pulmonary toxicity have occurred in patients receiving prolonged carmustine therapy with total doses exceeding 1400 mg/sq m; however, pulmonary fibrosis has occurred with lower total doses. Other risk factors include prior history of pulmonary disease and duration of carmustine therapy. Pulmonary toxicity occasionally has been rapidly progressive and/or fatal.

American Society of Health System Pharmacists; AHFS Drug Information 2009. Bethesda, MD. (2009), p. 980-1


For more Drug Warnings (Complete) data for Carmustine (41 total), please visit the HSDB record page.


4.4 Drug Indication

For the treatment of brain tumors, multiple myeloma, Hodgkin's disease and Non-Hodgkin's lymphomas.


FDA Label


Carmustine is effective in the following malignant neoplasms as a single agent or in combination with other antineoplastic agents and/or other therapeutic measures (radiotherapy, surgery):

- Brain tumours (glioblastoma, brain-stem gliomas, medulloblastoma, astrocytoma and ependymoma), brain metastases

- Secondary therapy in non-Hodgkins lymphoma and Hodgkins disease

- as conditioning treatment prior to autologous haematopoietic progenitor cell transplantation (HPCT) in malignant haematological diseases (Hodgkins disease / Non-hodgkins lymphoma).


5 Pharmacology and Biochemistry
5.1 Pharmacology

Carmustine is one of the nitrosoureas indicated as palliative therapy as a single agent or in established combination therapy with other approved chemotherapeutic agents in treatment of brain tumors, multiple myeloma, Hodgkin's disease, and non-Hodgkin's lymphomas. Although it is generally agreed that carmustine alkylates DNA and RNA, it is not cross resistant with other alkylators. As with other nitrosoureas, it may also inhibit several key enzymatic processes by carbamoylation of amino acids in proteins.


5.2 MeSH Pharmacological Classification

Antineoplastic Agents, Alkylating

A class of drugs that differs from other alkylating agents used clinically in that they are monofunctional and thus unable to cross-link cellular macromolecules. Among their common properties are a requirement for metabolic activation to intermediates with antitumor efficacy and the presence in their chemical structures of N-methyl groups, that after metabolism, can covalently modify cellular DNA. The precise mechanisms by which each of these drugs acts to kill tumor cells are not completely understood. (From AMA, Drug Evaluations Annual, 1994, p2026) (See all compounds classified as Antineoplastic Agents, Alkylating.)


5.3 FDA Pharmacological Classification
5.3.1 Active Moiety
CARMUSTINE
5.3.2 FDA UNII
U68WG3173Y
5.3.3 Pharmacological Classes
Alkylating Drug [EPC]; Alkylating Activity [MoA]
5.4 ATC Code

L01AD01


L - Antineoplastic and immunomodulating agents

L01 - Antineoplastic agents

L01A - Alkylating agents

L01AD - Nitrosoureas

L01AD01 - Carmustine


5.5 Absorption, Distribution and Excretion

Absorption

5 to 28% bioavailability


Route of Elimination

Approximately 60% to 70% of a total dose is excreted in the urine in 96 hours and about 10% as respiratory CO2.


Following IV infusion of carmustine, the steady-state volume of distribution averaged 3.25 L/kg. Because of their high lipid solubility, carmustine and/or its metabolites readily cross the blood-brain barrier. Substantial CSF concentrations occur almost immediately after IV administration of carmustine, and CSF concentrations of radioactivity have been variously reported to range from 15-70% of concurrent plasma concentrations. Carmustine metabolites are distributed into milk, but in concentrations less than those in maternal plasma.

American Society of Health System Pharmacists; AHFS Drug Information 2009. Bethesda, MD. (2009), p. 983


The absorption of the copolymer contained in carmustine wafers has not been evaluated in humans. Plasma concentrations of carmustine following intracranial implantation of the wafers have not been determined in humans, but in rabbits undergoing surgical implantation of wafers containing 3.85% carmustine, no detectable levels of carmustine were observed in plasma.

American Society of Health System Pharmacists; AHFS Drug Information 2009. Bethesda, MD. (2009), p. 983


When the carmustine wafer is exposed to the aqueous environment of the resection cavity, hydrolysis of the anhydride bonds in the copolymer occurs, resulting in the release of carmustine and two monomers, carboxyphenoxypropane, and sebacic acid. The carmustine contained in the wafer diffuses into the surrounding brain tissue. The metabolism and excretion of the copolymer contained in carmustine wafers has not been evaluated in humans. Animal studies have shown that more than 70% of the copolymer degrades within 3 weeks following implantation of carmustine wafers into brain tissue; following hydrolysis of the copolymer, carboxyphenoxypropane is eliminated renally, while sebacic acid (an endogenous fatty acid) is metabolized in the liver and expired as carbon dioxide. In humans, wafer remnants have been observed on brain imaging scans or located during subsequent surgical procedures up to 8 months following intracranial implantation. Wafer remnants retrieved from 2 patients approximately 2-3 months after implantation were analyzed and found to consist mostly of water and monomeric components with minimal detectable amounts of carmustine.

American Society of Health System Pharmacists; AHFS Drug Information 2009. Bethesda, MD. (2009), p. 983


The disappearance of 1,3-bis(2-chlorethyl)-1-nitrosourea (BCNU) from plasma, liver, kidney, lung, brain, spleen, tumor tissue and epididymal adipose tissue of Walker 256/B carcinoma-bearing rats and healthy animals was measured by differential pulse polarography after i.v. bolus of the drug. Only BCNU, not its decomposition products, was detected by the polarographic assay. Levels of BCNU in liver of tumor-bearing animals were significantly lower (about 10 times) than those on healthy rats. A bi-exponential fit was used to calculate the kinetics of BCNU in plasma, kidney, lung and brain, but no difference could be found between healthy and Walker tumor-bearing rats. BCNU disappeared faster from adipose tissue of tumor-bearing animals than from normals.

PMID:6531791 Bartosek I et al; Tumori 70 (6): 491-8 (1984).


Some 40 minutes after injection, BCNU is no longer an effective antitumour agent, and a few minutes after administration no unchanged BCNU can be detected in plasma. Following its ip or sc injection or oral administration, BCNU was rapidly distributed to most tissues, including brain and cerebrospinal fluid. Excretion was primarily in the urine; it was most rapid in mice (80% of the dose excreted in 24 hours) and less rapid in monkeys and dogs.

IARC. Monographs on the Evaluation of the Carcinogenic Risk of Chemicals to Humans. Geneva: World Health Organization, International Agency for Research on Cancer, 1972-PRESENT. (Multivolume work). Available at: https://monographs.iarc.fr/ENG/Classification/index.php, p. V26 85 (1981)


5.6 Metabolism/Metabolites

Hepatic and rapid with active metabolites. Metabolites may persist in the plasma for several days.


The in vitro metabolism of the anticancer agent 1,3-bis(2-chloroethyl)-1-nitrosourea (BCNU) has been studied in male Fischer 344 rat liver microsomal preparations. The previously identified product, 1,3-bis(2-chloroethyl)urea (BCU), has been shown to be the major metabolite. Stable isotope labeling and mass spectral analysis of isolated metabolites indicate that BCU is formed exclusively from the metabolic denitrosation of BCNU. The rate of BCNU chemical decomposition in rat liver microsomal preparations deficient in NADPH and the metabolic disappearance rate in preparations containing added NADPH were measured and compared with the measured rate of metabolic formation of BCU under the same conditions. The rate of NADPH-dependent BCNU metabolism and BCU formation are equal within experimental error. BCNU was found to inhibit the rat liver 9000 g supernatant metabolism of 1-(2-chloroethyl)-3-cyclohexyl-1-nitrosourea (CCNU).

PMID:7252986 Lin HS, Weinkam RJ; J Med Chem 24 (6): 761-3 (1981).


5.7 Biological Half-Life

15-30 minutes


5.8 Mechanism of Action

Carmustine causes cross-links in DNA and RNA, leading to the inhibition of DNA synthesis, RNA production and RNA translation (protein synthesis). Carmustine also binds to and modifies (carbamoylates) glutathione reductase. This leads to cell death.


Temozolomide (TMZ) and carmustine (BCNU), cancer-drugs usually used in the treatment of gliomas, are DNA-methylating agents producing O6-methylguanine. It has been shown that 06-methylguanine triggers DNA mismatch repair and in turn induce apoptosis and senescence, respectively, over a 4 and 6 days period. Temozolomide and carmustine have an earlier effect on nuclear organization and chromatin structure. In particular, temozolomideZ and carmustine induce clustering of pericentromeric heterochromatin regions and increase the amount of heterochromatic proteins MeCP2 and HP1alpha bound to chromatin. These drugs also decrease global levels of histone H3 acetylation and increase levels of histone H3 trimethylated on lysine 9 (H3-triMeK9). These events precede the senescence status. ... Temozolomide and carmustine efficacy in glioma treatment may implicate a first event characterized by changes in heterochromatin organization and its silencing which is then followed by apoptosis and senescence.

PMID:19116135 Papait R et al; Biochem Biophys Res Commun 379 (2): 434-9 (2009).


Although carmustine is believed to act by alkylation of DNA and RNA, the mechanism of action has not been completely elucidated and other effects such as carbamoylation and modification of cellular proteins may be involved. The overall result is thought to be the inhibition of both DNA and RNA synthesis.

American Society of Health System Pharmacists; AHFS Drug Information 2009. Bethesda, MD. (2009), p. 983