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Also known as: Demethylchlortetracycline, Dmct, 127-33-3, Ledermycin, Demethylchlortetracyclin, 6-demethyl-7-chlorotetracycline
Molecular Formula
C21H21ClN2O8
Molecular Weight
464.9  g/mol
InChI Key
GUXHBMASAHGULD-SEYHBJAFSA-N
FDA UNII
5R5W9ICI6O

CAS 127-33-3
A TETRACYCLINE analog having a 7-chloro and a 6-methyl. Because it is excreted more slowly than TETRACYCLINE, it maintains effective blood levels for longer periods of time.
Demeclocycline is a Tetracycline-class Antimicrobial.
1 2D Structure

CAS 127-33-3

2 Identification
2.1 Computed Descriptors
2.1.1 IUPAC Name
(4S,4aS,5aS,6S,12aR)-7-chloro-4-(dimethylamino)-1,6,10,11,12a-pentahydroxy-3,12-dioxo-4a,5,5a,6-tetrahydro-4H-tetracene-2-carboxamide
2.1.2 InChI
InChI=1S/C21H21ClN2O8/c1-24(2)14-7-5-6-10(16(27)12-9(25)4-3-8(22)11(12)15(6)26)18(29)21(7,32)19(30)13(17(14)28)20(23)31/h3-4,6-7,14-15,25-27,30,32H,5H2,1-2H3,(H2,23,31)/t6-,7-,14-,15-,21-/m0/s1
2.1.3 InChI Key
GUXHBMASAHGULD-SEYHBJAFSA-N
2.1.4 Canonical SMILES
CN(C)C1C2CC3C(C4=C(C=CC(=C4C(=C3C(=O)C2(C(=C(C1=O)C(=O)N)O)O)O)O)Cl)O
2.1.5 Isomeric SMILES
CN(C)[C@H]1[C@@H]2C[C@@H]3[C@@H](C4=C(C=CC(=C4C(=C3C(=O)[C@@]2(C(=C(C1=O)C(=O)N)O)O)O)O)Cl)O
2.2 Other Identifiers
2.2.1 UNII
5R5W9ICI6O
2.3 Synonyms
2.3.1 MeSH Synonyms

1. Declomycin

2. Demeclocycline Hydrochloride

3. Demeclocycline Monohydrochloride

4. Demeclocycline, 4-epimer

5. Demeclocycline, Calcium (1:1) Salt

6. Demeclocycline, Calcium (1:2) Salt

7. Demethylchlortetracycline

8. Hydrochloride, Demeclocycline

9. Ldermycine

10. Ledermycin

11. Monohydrochloride, Demeclocycline

2.3.2 Depositor-Supplied Synonyms

1. Demethylchlortetracycline

2. Dmct

3. 127-33-3

4. Ledermycin

5. Demethylchlortetracyclin

6. 6-demethyl-7-chlorotetracycline

7. 7-chloro-6-demethyltetracycline

8. Demeclociclina

9. Demeclocyclinum

10. Demethylchlorotetracycline

11. Demethylchlortetracyclinum

12. 6-demethylchlorotetracycline

13. Tri-demethylchlortetracycline

14. 6-demethylchlortetracycline

15. Dmctc

16. Demeclocyclinum [inn-latin]

17. Demeclociclina [inn-spanish]

18. Novotriclina

19. Demeclor

20. Demetraclin

21. Diuciclin

22. Mexocine

23. Perciclina

24. Sumaclina

25. Deganol

26. Dmct (antibiotic)

27. Demethylchlortetracycline Base

28. 5r5w9ici6o

29. 6-demethyl-7-chlortetracycline

30. Chebi:4392

31. 127-33-3 (free Base)

32. Chlortetracycline, 6-demethyl-

33. (4s,4as,5as,6s,12ar)-7-chloro-4-(dimethylamino)-1,6,10,11,12a-pentahydroxy-3,12-dioxo-4a,5,5a,6-tetrahydro-4h-tetracene-2-carboxamide

34. (4s,4as,5as,6s,12as)-7-chloro-4-(dimethylamino)-3,6,10,12,12a-pentahydroxy-1,11-dioxo-1,4,4a,5,5a,6,11,12a-octahydrotetracene-2-carboxamide

35. 7-chloro-4-(dimethylamino)-1,4,4a,5,5a,6,11,12a-octahydro-3,6,10,12,12a-pentahydroxy-1,11-dioxo-2-naphthacenecarboxamide

36. Tetracycline, 7-chloro-6-demethyl-

37. Rp 10192

38. [4s-(4alpha,4aalpha,5aalpha,6beta,12aalpha)]-7-chloro-4-(dimethylamino)1,4,4a,5,5a,6,11,12a-octahydro-3,6,10,12,12a-pentahydroxy-1,11-dioxo-2-naphthacenecarboxamide

39. Demeclocycline [usan:ban]

40. Demethylchlortetracycline (jan)

41. Demethylchlortetracycline [jan]

42. 6-demetil-7-clorotetraciclina

43. Hsdb 3051

44. Methylchlorotetracycline

45. Einecs 204-834-8

46. Unii-5r5w9ici6o

47. 6-demetil-7-clorotetraciclina [italian]

48. Demeclocycline [usp:inn:ban]

49. Demeclocycline (usp)

50. Spectrum_000896

51. Prestwick0_000753

52. Prestwick1_000753

53. Prestwick2_000753

54. Prestwick3_000753

55. Spectrum2_001132

56. Spectrum3_000378

57. Spectrum4_000313

58. Spectrum5_000831

59. Demeclocycline [mi]

60. Schembl3252

61. Chembl1591

62. Demeclocycline [inn]

63. Lopac0_000421

64. Bspbio_000766

65. Bspbio_002135

66. Demeclocycline [hsdb]

67. Kbiogr_000926

68. Kbioss_001376

69. 2-naphthacenecarboxamide, 7-chloro-4-(dimethylamino)-1,4,4a,5,5a,6,11,12a-octahydro-3,6,10,12,12a-pentahydroxy-1,11-dioxo-, (4s-(4alpha,4aalpha,5aalpha,6beta,12aalpha))-

70. Demeclocycline [vandf]

71. Divk1c_000863

72. Schembl516084

73. Spbio_001023

74. Spbio_002705

75. Demeclocycline [mart.]

76. Bpbio1_000844

77. Demeclocycline [who-dd]

78. Dtxsid1022893

79. Schembl13169106

80. Schembl17710674

81. Gtpl10905

82. Kbio1_000863

83. Kbio2_001376

84. Kbio2_003944

85. Kbio2_006512

86. Kbio3_001355

87. Ninds_000863

88. 2-naphthacenecarboxamide, 7-chloro-4-(dimethylamino)-1,4,4a,5,5a,6,11,12a-octahydro-3,6,10,12,12a-pentahydroxy-1,11-dioxo-, (4s-(4.alpha.,4a.alpha.,5a.alpha.,6.beta.,12a.alpha.))-

89. Rkl10089

90. Demeclocycline [usp Monograph]

91. Zinc100036924

92. Ccg-204513

93. Db00618

94. Sdccgsbi-0050406.p005

95. Idi1_000863

96. Smp1_000091

97. 1,3,5-benzenetrisulfonylchloride

98. Ncgc00162149-02

99. Ncgc00162149-03

100. Ncgc00162149-04

101. Ncgc00162149-06

102. Ncgc00162149-10

103. Ncgc00162149-14

104. 2-naphthacenecarboxamide, 7-chloro-4-(dimethylamino)-1,4,4a,5,5a,6,11,12a-octahydro-3,6,10,12,12a-pentahydroxy-1,11-dioxo-, (4s,4as,5as,6s,12as)-

105. Sbi-0050406.p004

106. Hy-121268

107. Cs-0081339

108. D03680

109. Ab00053449_04

110. Sr-01000000066

111. J-005483

112. Q2736402

113. Sr-01000000066-4

114. Chlortetracycline Hydrochloride Impurity B [ep Impurity]

115. (4s,4as,5as,6s,12as)-7-chloro-4-(dimethylamino)-3,6,10,12,12a-pentahydroxy-1,11-dioxo-4a,5,5a,6-tetrahydro-4h-tetracene-2-carboxamide

116. 7-chloro-4-dimethylamino-3,6,10,12,12a-pentahydroxy-1,11-dioxo-1,4,4a,5,5a,6,11,12a-octahydro-naphthacene-2-carboxylic Acid Amide

2.4 Create Date
2011-12-26
3 Chemical and Physical Properties
Molecular Weight 464.9 g/mol
Molecular Formula C21H21ClN2O8
XLogP30.7
Hydrogen Bond Donor Count6
Hydrogen Bond Acceptor Count9
Rotatable Bond Count2
Exact Mass464.0986433 g/mol
Monoisotopic Mass464.0986433 g/mol
Topological Polar Surface Area182 Ų
Heavy Atom Count32
Formal Charge0
Complexity961
Isotope Atom Count0
Defined Atom Stereocenter Count5
Undefined Atom Stereocenter Count0
Defined Bond Stereocenter Count0
Undefined Bond Stereocenter Count0
Covalently Bonded Unit Count1
4 Drug and Medication Information
4.1 Therapeutic Uses

Antibiotics, Tetracycline

National Library of Medicine's Medical Subject Headings online file (MeSH, 1999)


Tetracyclines are especially useful in diseases caused by rickettsiae, mycoplasmas, & chlamydiae. /Tetracyclines/

Hardman, J.G., L.E. Limbird, P.B. Molinoff, R.W. Ruddon, A.G. Goodman (eds.). Goodman and Gilman's The Pharmacological Basis of Therapeutics. 9th ed. New York, NY: McGraw-Hill, 1996., p. 1243


...THEY ARE OF PROVEN VALUE.../AGAINST/ ROCKY MOUNTAIN SPOTTED FEVER, MURINE TYPHUS, RECRUDESCENT EPIDEMIC TYPHUS, SCRUB TYPHUS, Q FEVER, LYMPHOGRANULOMA VENEREUM, PSITTACOSIS, TULAREMIA, BRUCELLOSIS, GONORRHEA, CERTAIN URINARY TRACT INFECTIONS, OCULAR INFECTIONS, GRANULOMA INGUINALE, CHANCROID, SYPHILIS... /TETRACYCLINES/

Hardman, J.G., L.E. Limbird, P.B. Molinoff, R.W. Ruddon, A.G. Goodman (eds.). Goodman and Gilman's The Pharmacological Basis of Therapeutics. 9th ed. New York, NY: McGraw-Hill, 1996., p. 1241


...THEY ARE OF PROVEN VALUE.../AGAINST/ DISEASE DUE TO BACTEROIDES & CLOSTRIDIUM. /TETRACYCLINES/

Goodman, L.S., and A. Gilman. (eds.) The Pharmacological Basis of Therapeutics. 5th ed. New York: Macmillan Publishing Co., Inc., 1975., p. 1191


For more Therapeutic Uses (Complete) data for DEMECLOCYCLINE (8 total), please visit the HSDB record page.


4.2 Drug Warning

... /Tetracyclines/ should not be given to pregnant patients; they should not be employed for treatment of common infections in children under the age of 8 yr; & unused supplies of these antibiotics should be discarded. /Tetracyclines/

Hardman, J.G., L.E. Limbird, P.B. Molinoff, R.W. Ruddon, A.G. Goodman (eds.). Goodman and Gilman's The Pharmacological Basis of Therapeutics. 9th ed. New York, NY: McGraw-Hill, 1996., p. 1246


Tetracyclines may aggravate uremia in patients with renal disease by inhibiting protein synthesis & provoking a catabolic effect. /Tetracyclines/

Hardman, J.G., L.E. Limbird, P.B. Molinoff, R.W. Ruddon, A.G. Goodman (eds.). Goodman and Gilman's The Pharmacological Basis of Therapeutics. 9th ed. New York, NY: McGraw-Hill, 1996., p. 1245


Tetracyclines are incompletely absorbed from the GI tract, such that high concns are reached in the bowel, & therefore the enteric flora is markedly altered. Many aerobic & anaerobic coliform microorganisms & gram-positive spore-forming bacteria are sensitive & may be suppressed markedly during long-term tetracycline regimens before resistant strains reappear. /Tetracyclines/

Hardman, J.G., L.E. Limbird, P.B. Molinoff, R.W. Ruddon, A.G. Goodman (eds.). Goodman and Gilman's The Pharmacological Basis of Therapeutics. 9th ed. New York, NY: McGraw-Hill, 1996., p. 1241


Because of the emergence of resistance, the tetracyclines are no longer indicated for infections caused by staphylococci, streptococci, or meningococci. /Tetracyclines/

Hardman, J.G., L.E. Limbird, P.B. Molinoff, R.W. Ruddon, A.G. Goodman (eds.). Goodman and Gilman's The Pharmacological Basis of Therapeutics. 9th ed. New York, NY: McGraw-Hill, 1996., p. 1244


For more Drug Warnings (Complete) data for DEMECLOCYCLINE (19 total), please visit the HSDB record page.


4.3 Minimum/Potential Fatal Human Dose

2 TO 3. 2= SLIGHTLY TOXIC: PROBABLE ORAL LETHAL DOSE (HUMAN) 5-15 G/KG, BETWEEN 1 PINT & 1 QT FOR 70 KG PERSON (150 LB). 3= MODERATELY TOXIC: PROBABLE ORAL LETHAL DOSE (HUMAN) 0.5-5 G/KG, BETWEEN 1 OZ & 1 PINT FOR 70 KG PERSON (150 LB).

Gosselin, R.E., H.C. Hodge, R.P. Smith, and M.N. Gleason. Clinical Toxicology of Commercial Products. 4th ed. Baltimore: Williams and Wilkins, 1976., p. II-172


4.4 Drug Indication

Used primarily to treat Lyme disease, acne, and bronchitis. Also indicated (but rarely used) to treat urinary tract infections, gum disease, malaria, and other bacterial infections such as gonorrhea and chlamydia. One of its other registered uses is the treatment of hyponatremia (low blood sodium concentration) due to the syndrome of inappropriate antidiuretic hormone (SIADH) where fluid restriction alone has been ineffective.


5 Pharmacology and Biochemistry
5.1 Pharmacology

Demeclocycline is a tetracycline antibiotic active against the following microorganisms: Rickettsiae (Rocky Mountain spotted fever, typhus fever and the typhus group, Q fever, rickettsial pox, tick fevers), Mycoplasma pneumoniae (PPLO, Eaton agent), agents of psittacosis and ornithosis, agents of lymphogranulomavenereum and granuloma inguinale, the spirochetal agent of relapsing fever (Borrelia recurrentis), Haemophilus ducreyi (chancroid), Yersinia pestis, Pasteurella pestis and Pasteurella tularensis, Bartonella bacilliformis, Bacteroides species, Vibrio comma and Vibrio fetus, and Brucella species (in conjunction with streptomycin). Demeclocycline inhibits cell growth by inhibiting translation. Demeclocycline is lipophilic and can easily pass through the cell membrane or passively diffuses through porin channels in the bacterial membrane. Demeclocycline is not a direct bactericidal agent; rather, it is a bacteriostatic drug that impairs bacterial growth. Because it is excreted more slowly than tetracycline, it maintains effective blood levels for longer periods of time.


5.2 MeSH Pharmacological Classification

Anti-Bacterial Agents

Substances that inhibit the growth or reproduction of BACTERIA. (See all compounds classified as Anti-Bacterial Agents.)


5.3 FDA Pharmacological Classification
5.3.1 Active Moiety
DEMECLOCYCLINE
5.3.2 FDA UNII
5R5W9ICI6O
5.3.3 Pharmacological Classes
Tetracyclines [CS]; Tetracycline-class Antimicrobial [EPC]
5.4 ATC Code

D - Dermatologicals

D06 - Antibiotics and chemotherapeutics for dermatological use

D06A - Antibiotics for topical use

D06AA - Tetracycline and derivatives

D06AA01 - Demeclocycline


J - Antiinfectives for systemic use

J01 - Antibacterials for systemic use

J01A - Tetracyclines

J01AA - Tetracyclines

J01AA01 - Demeclocycline


5.5 Absorption, Distribution and Excretion

Absorption

Tetracyclines are readily absorbed.


Route of Elimination

Demeclocycline hydrochloride, like other tetracyclines, is concentrated in the liver and excreted into the bile where it is found in much higher concentrations than in the blood. Following a single 150 mg dose of demeclocycline hydrochloride in normal volunteers, 44% (n = 8) was excreted in urine and 13% and 46%, respectively, were excreted in feces in two patients within 96 hours as active drug.


Clearance

Renal cl=35 mL/min/1.73 m2


Tetracyclines are deposited in the skeleton during gestation & throughout childhood. /Tetracyclines/

Hardman, J.G., L.E. Limbird, P.B. Molinoff, R.W. Ruddon, A.G. Goodman (eds.). Goodman and Gilman's The Pharmacological Basis of Therapeutics. 9th ed. New York, NY: McGraw-Hill, 1996., p. 1245


Tetracyclines distribute widely throughout the body & into tissues & secretions, including the urine & prostate. They accumlate in the reticuloendothelial cells of the liver, spleen, & bone marrow, & in bone, dentine, & the enamel of unerupted teeth. /Tetracyclines/

Hardman, J.G., L.E. Limbird, P.B. Molinoff, R.W. Ruddon, A.G. Goodman (eds.). Goodman and Gilman's The Pharmacological Basis of Therapeutics. 9th ed. New York, NY: McGraw-Hill, 1996., p. 1242


Tetracyclines cross the placenta & enter the fetal circulation & amniotic fluid. Concn of tetracycline in umbilical-cord plasma reach 60%, & in amniotic fluid 20%, of those in the circulation of the mother. Relatively high concns of these drugs also are found in breast milk. /Tetracyclines/

Hardman, J.G., L.E. Limbird, P.B. Molinoff, R.W. Ruddon, A.G. Goodman (eds.). Goodman and Gilman's The Pharmacological Basis of Therapeutics. 9th ed. New York, NY: McGraw-Hill, 1996., p. 1242


AFTER ORAL ADMIN OF DEMETHYLCHLORTETRACYCLINE (FREE BASE & HCL SALT) TO RATS, PLASMA LEVELS FROM EACH WERE ESSENTIALLY IDENTICAL.

MIYAZAKI S ET AL; COMPARISON OF BIOAVAILABILITY OF FREE BASES & HCL SALTS OF CHLORTETRACYCLINE, DEMETHYLCHLORTETRACYCLINE & METHACYCLINE; CHEM PHARM BULL 23 (9): 2151 (1975)


The newer tetracyclines are defined as those tetracyclines available in the United States but not approved for veterinary use. These include demeclocycline, methacycline, doxycycline, & minocycline. Of these, doxycycline & minocycline appear to offer advantages that would render them useful in certain situations in veterinary medicine. Their major advantage lies in their greater lipid solubility relative to other tetracyclines. This characteristic probably accounts for their enhanced antimicrobial effectiveness for some organisms, more efficient absorption after oral admin, & enhanced distribution in the body. The principal excretory organ for doxycycline is the intestine, where the drug diffuses through the intestinal mucosa into the intestinal tract. This unique characteristic makes this drug useful in cases of preexisting renal dysfunction & may render this drug superior to other tetracyclines in the treatment of intestinal infections. Doxycycline is used in other countries for respiratory tract & intestinal tract diseases of poultry. The usefulness of doxycycline & minocycline in food-producing animals may be limited because of persistent drug residues. Minocycline has, in large doses, been used with streptomycin in the elimination of the carrier state of canine brucellosis. The superiority of doxycycline & minocycline, relative to other tetracyclines, in their distribution to areas of the body such as the eye, brain, cerebrospinal fluid, & prostate gland suggests that trials of their efficacy in tetracycline-sensitive infections of these areas are indicated. Pharmacokinetic studies designed to determine optimal dosage schedules have not been made for domestic animals. These determinations are necessary to evaluate most effectively the usefulness of the newer tetracyclines in veterinary medicine.

PMID:7216873 Aronson AL; J Am Vet Med Assoc 176 (10 Spec No): 1061-1068 (1980)


5.6 Metabolism/Metabolites

Hepatic


5.7 Biological Half-Life

10-17 hours


IN PLASMA, IT IS PROTEIN-BOUND 41 TO 90%. ITS T/2 IS ABOUT 12 HR. /HCL/

Osol, A. and J.E. Hoover, et al. (eds.). Remington's Pharmaceutical Sciences. 15th ed. Easton, Pennsylvania: Mack Publishing Co., 1975., p. 1139


5.8 Mechanism of Action

Demeclocycline inhibits cell growth by inhibiting translation. It binds (reversibly) to the 30S and 50S ribosomal subunit and prevents the amino-acyl tRNA from binding to the A site of the ribosome, which impairs protein synthesis by bacteria. The binding is reversible in nature. The use in SIADH actually relies on a side-effect of tetracycline antibiotics; many may cause diabetes insipidus (dehydration due to the inability to concentrate urine). It is not completely understood why demeclocycline impairs the action of antidiuretic hormone, but it is thought that it blocks the binding of the hormone to its receptor.


Tetracyclines inhibit bacterial protein synthesis by binding to the 30 S bacterial ribosome & preventing access of aminoacyl tRNA to the acceptor (A) site on the mRNA-ribosome complex. They enter gram-negative bacteria by passive diffusion through the hydrophilic channels, formed by the porin proteins of the outer cell membrane, & active transport by an energy-dependent system that pumps all tetracyclines across cytoplasmic membrane. Although permeation of these drugs into gram-positive bacteria is less well understood it also is energy requiring. /Tetracyclines/

Hardman, J.G., L.E. Limbird, P.B. Molinoff, R.W. Ruddon, A.G. Goodman (eds.). Goodman and Gilman's The Pharmacological Basis of Therapeutics. 9th ed. New York, NY: McGraw-Hill, 1996., p. 1241


...INHIBITORY EFFECTS OF TETRACYCLINES CAN BE REVERSED BY WASHING. THEREFORE, IT IS PROBABLE THAT REVERSIBLY BOUND ANTIBIOTIC IS RESPONSIBLE FOR ANTIBACTERIAL ACTION. /TETRACYCLINES/

Goodman, L.S., and A. Gilman. (eds.) The Pharmacological Basis of Therapeutics. 5th ed. New York: Macmillan Publishing Co., Inc., 1975., p. 1185


... Drugs to antagonize /antidiuretic hormone/, ADH, action can be used /to treat the syndrome of inappropriate antidiuretic hormone secretion/. These include a loop diuretic, demeclocycline ... . ... Demeclocycline & lithium directly impair the response to ADH at the collecting tubule, inducing nephrogenic diabetes insipidus. Demeclocycline usually is better tolerated than lithium.

Young, L.Y., M.A. Koda-Kimble (eds.). Applied Therapeutics. The Clinical Use of Drugs. 6th ed. Vancouver, WA., Applied Therapeutics, Inc. 1995., p. 28-10


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Demeclocycline (DMCT)

CAS Number : 127-33-3

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