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Also known as: 59-43-8, Thiamine chloride, Thiamine monochloride, Aneurine, Vitaneurin, Bethiamin
Molecular Formula
C12H17ClN4OS
Molecular Weight
300.81  g/mol
InChI Key
MYVIATVLJGTBFV-UHFFFAOYSA-M

59-43-8
3-((4-Amino-2-methyl-5-pyrimidinyl)methyl)-5-(2- hydroxyethyl)-4-methylthiazolium chloride.
1 2D Structure

59-43-8

2 Identification
2.1 Computed Descriptors
2.1.1 IUPAC Name
2-[3-[(4-amino-2-methylpyrimidin-5-yl)methyl]-4-methyl-1,3-thiazol-3-ium-5-yl]ethanol;chloride
2.1.2 InChI
InChI=1S/C12H17N4OS.ClH/c1-8-11(3-4-17)18-7-16(8)6-10-5-14-9(2)15-12(10)13;/h5,7,17H,3-4,6H2,1-2H3,(H2,13,14,15);1H/q+1;/p-1
2.1.3 InChI Key
MYVIATVLJGTBFV-UHFFFAOYSA-M
2.1.4 Canonical SMILES
CC1=C(SC=[N+]1CC2=CN=C(N=C2N)C)CCO.[Cl-]
2.2 Synonyms
2.2.1 MeSH Synonyms

1. Aneurin

2. Mononitrate, Thiamine

3. Thiamin

4. Thiamine

5. Thiamine Mononitrate

6. Vitamin B 1

2.2.2 Depositor-Supplied Synonyms

1. 59-43-8

2. Thiamine Chloride

3. Thiamine Monochloride

4. Aneurine

5. Vitaneurin

6. Bethiamin

7. Oryzanin

8. Beivon

9. Apatate Drape

10. 3-((4-amino-2-methylpyrimidin-5-yl)methyl)-5-(2-hydroxyethyl)-4-methylthiazol-3-ium Chloride

11. Thiacoat

12. Tiamina

13. Thiaminum

14. Betabion

15. Thiamine(1+) Chloride

16. Vitamin B-1

17. Thiaminum [inn-latin]

18. Tiamina [inn-spanish]

19. Ccris 5823

20. Hsdb 220

21. X66nso3n35

22. Einecs 200-425-3

23. Chebi:33283

24. Thiamine (inn)

25. Unii-x66nso3n35

26. 3-[(4-amino-2-methylpyrimidin-5-yl)methyl]-5-(2-hydroxyethyl)-4-methyl-1,3-thiazol-3-ium Chloride

27. Oryzanine

28. Thiamine [inn]

29. Thiamine (vit B1)

30. 3-((4-amino-2-methyl-5-pyrimidinyl)methyl)-5-(2-hydroxyethyl)-4-methylthiazolium Chloride

31. Thiamine, Chloride

32. B-amin

33. Thiamine [inn:ban]

34. 3-[(4-amino-2-methyl-5-pyrimidinyl)methyl]-5-(2-hydroxyethyl)-4-methylthiazolium Chloride

35. Dtxsid2023648

36. Thiazolium,3-[(4-amino-2-methyl-5-pyrimidinyl)methyl]-5-(2-hydroxyethyl)-4-methyl-chloride

37. Thiamine Hydrochloride;3-((4-amino-2-methyl-5-pyrimidinyl)methyl)-5-(2- Hydroxyethyl)-4-methylthiazolium Chloride;3-((4-amino-2-methylpyrimidin-5-yl)methyl)-5-(2-hydroxyethyl)-4-methylthiazol-3-ium Chloride

38. Nsc36226

39. Oryzenin

40. Vitamin B1 (tn)

41. Vitamin B1 ,(s)

42. Thiamine [hsdb]

43. Thiamine [mi]

44. Thiamine [vandf]

45. Thiamine [who-dd]

46. 3-((4-amino-2-methyl-5-pyrimidinyl)methyl)-5-(2-hydrox Yethyl)-4-methylthiazolium Chloride

47. Chembl1588

48. Thiazolium, 3-((4-amino-2-methyl-5-pyrimidinyl)methyl)-5-(2-hydroxyethyl)-4-methyl- Chloride

49. Thiazolium, 3-((4-amino-2-methyl-5-pyrimidinyl)methyl)-5-(2-hydroxyethyl)-4-methyl-chloride

50. Schembl10074

51. Vitamin B1 [vandf]

52. Mls001304099

53. Thiamine [orange Book]

54. Vitamin B1 [green Book]

55. Hms2233p06

56. Hms3372n17

57. Hy-a0100

58. Mfcd00044586

59. Akos015960561

60. 1st1504

61. Cs-7793

62. Ac-11683

63. As-15935

64. Smr000718788

65. Db-017724

66. Ft-0603249

67. Ns00099891

68. D08580

69. En300-257540

70. A832318

71. W-105322

72. Q27115611

73. 2-[3-[(4-amino-2-methyl-pyrimidin-5-yl)methyl]-4-methyl-thiazol-3-ium-5-yl]ethanol Chloride;vitamin B1

74. Thiazolium, 3-((4-amino-2-methyl-5-pyrimidinyl)methyl)-5-(2-hydroxyethyl)-4-methyl- Chloride (1:1)

75. Thiazolium, 3-((4-amino-2-methyl-5-pyrimidinyl)methyl)-5-(2-hydroxyethyl)-4-methyl-, Chloride (1:1)

2.3 Create Date
2005-07-19
3 Chemical and Physical Properties
Molecular Weight 300.81 g/mol
Molecular Formula C12H17ClN4OS
Hydrogen Bond Donor Count2
Hydrogen Bond Acceptor Count6
Rotatable Bond Count4
Exact Mass g/mol
Monoisotopic Mass g/mol
Topological Polar Surface Area104
Heavy Atom Count19
Formal Charge0
Complexity269
Isotope Atom Count0
Defined Atom Stereocenter Count0
Undefined Atom Stereocenter Count0
Defined Bond Stereocenter Count0
Undefined Bond Stereocenter Count0
Covalently Bonded Unit Count2
4 Drug and Medication Information
4.1 Therapeutic Uses

Thiamine is used to prevent and to treat thiamine deficiency syndromes including beriberi, Wernicke's encephalopathy syndrome, delirium, and peripheral neuritis associated with pellagra or neuritis of pregnancy (if associated with severe vomiting).

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


Although thiamine has not been shown by well-controlled trials to have any therapeutic value, the drug has been used for the management of poor appetite, ulcerative colitis, chronic diarrhea, other GI disorders, and the cerebellar syndrome. Thiamine has also been used orally as an insect repellent, but there is a lack of adequate evidence to establish the efficacy of thiamine for this use.

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


Low plasma thiamine concentrations have been found in patients with type 1 and type 2 diabetes mellitus. In a small placebo-controlled study, benfotiamine /a related vitamin B1 substance/ 100 mg given four times daily by mouth significantly improved neuropathic pain in patients with diabetic polyneuropathy. /Benfotiamine/

Sweetman SC (ed), Martindale: The Complete Drug Reference. London: Pharmaceutical Press (2009), p.1976-7.


/This study assessed/ the effect of thiamine repletion on thiamine status, functional capacity, and left ventricular ejection fraction (LVEF) in patients with moderate to severe congestive heart failure (CHF) who had received furosemide in doses of 80 mg/d or more for at least 3 months. PATIENTS AND METHODS: Thirty patients were randomized to 1 week of double-blind inpatient therapy with either iv thiamine 200 mg/d or placebo (n = 15 each). All previous drugs were continued. Following discharge, all 30 patients received oral thiamine 200 mg/d as outpatients for 6 weeks. Thiamine status was determined by the erythrocyte thiamine-pyrophosphate effect (TPPE). LVEF was determined by echocardiography. RESULTS: TPPE, diuresis, and LVEF were unchanged with iv placebo. After iv thiamine, TPPE decreased (11.7% +/- 6.5% to 5.4% +/- 3.2%; P < 0.01). LVEF increased (0.28 +/- 0.11 to 0.32 +/- 0.09; P < 0.05), as did diuresis (1,731 +/- 800 mL/d to 2,389 +/- 752 mL/d; P < 0.02), and sodium excretion (84 +/- 52 mEq/d to 116 +/- 83 mEq/d, P < 0.05). In the 27 patients completing the full 7-week intervention, LVEF rose by 22% (0.27 +/- 0.10 to 0.33 +/- 0.11, P < 0.01). CONCLUSIONS: Thiamine repletion can improve left ventricular function and biochemical evidence of thiamine deficiency in some patients with moderate-to-severe CHF who are receiving longterm furosemide therapy.

PMID:7733128 Shimon I et al; Am J Med 98 (5): 485-90 (1995).


For more Therapeutic Uses (Complete) data for Vitamin B1 (11 total), please visit the HSDB record page.


4.2 Drug Warning

Serious hypersensitivity/anaphylactic reactions can occur, especially after repeated administration. Deaths have resulted from IV or IM administration of thiamine.

Novak, K.M. (ed.). Drug Facts and Comparisons2008 Edition. Wolters Kluwer Health. St. Louis, Missouri 2008., p. 18


Anaphylaxis as an adverse systemic reaction to thiamine (vitamin B1) has been described in the literature since 1938. Although its precise mechanism is still uncertain, the reaction appears to involve immediate type hypersensitivity and to be exclusively related to parenteral administration...

PMID:9846348 Morinville V et al; Schweiz Med Wochenschr 128 (44): 1743-4 (1998).


Anaphylaxis. There have been occasional reports of serious and even fatal responses to the parenteral administration of thiamin. The clinical characteristics have strongly suggested an anaphylactic reaction. Symptoms associated with thiamin-induced anaphylaxis include anxiety, pruritus, respiratory distress, nausea, abdominal pain, and shock, sometimes progressing to death.

NAS, Food and Nutrition Board, Institute of Medicine; Dietary Reference Intakes for Thiamin, Riboflavin, Niacin, Vitamin B6, Folate, Vitamin B12, Pantothenic Acid, Biotin, and Choline. National Academy Press, Washington, D.C., pg. 81, 1998. Available from, as of March 2, 2010: https://www.nap.edu/catalog/6015.html


Adverse reactions with thiamine are rare, but hypersensitivity reactions have occurred, mainly after parenteral doses. These reactions have ranged in severity from very mild to, very rarely, fatal anaphylactic shock ... The UK Committee on Safety of Medicines had received, between 1970 and July, 1988, 90 reports of adverse reactions associated with the use of an injection containing high doses of vitamins B and C. The most frequent reactions were anaphylaxis (41 cases, including 2 fatalities), dyspnea or bronchospasm (13 cases), and rash or flushing (22 cases); 78 of the reactions occurred during, or shortly after, intravenous injection and the other 12 after intramuscular injectdion. They recommended that parenteral treatment be used only when essential, and that, when given, facilities for treating anaphylaxis should be available. They also recommended that, when the intravenous route was used, the injection be given slowly (over 10 minutes). Various authors have noted that parenteral treatment is essential for the prophylaxis and treatment of Wernicke's encephalopathy. However, further reports of anaphylaxis to parenteral thiamine have since been described, including one with a fatal outcome.

Sweetman SC (ed), Martindale: The Complete Drug Reference. London: Pharmaceutical Press (2009), p.1976.


For more Drug Warnings (Complete) data for Vitamin B1 (15 total), please visit the HSDB record page.


5 Pharmacology and Biochemistry
5.1 MeSH Pharmacological Classification

Vitamin B Complex

A group of water-soluble vitamins, some of which are COENZYMES. (See all compounds classified as Vitamin B Complex.)


5.2 ATC Code

A11DA01

S76 | LUXPHARMA | Pharmaceuticals Marketed in Luxembourg | Pharmaceuticals marketed in Luxembourg, as published by d'Gesondheetskeess (CNS, la caisse nationale de sante, www.cns.lu), mapped by name to structures using CompTox by R. Singh et al. (in prep.). List downloaded from https://cns.public.lu/en/legislations/textes-coordonnes/liste-med-comm.html. Dataset DOI:10.5281/zenodo.4587355


A - Alimentary tract and metabolism

A11 - Vitamins

A11D - Vitamin b1, plain and in combination with vitamin b6 and b12

A11DA - Vitamin b1, plain

A11DA01 - Thiamine (vit B1)


5.3 Absorption, Distribution and Excretion

Absorption of thiamin occurs mainly in the jejunum. At low concentrations of thiamin, absorption occurs by an active transport system that involves phosphyrylation; at higher concentrations, absorption occurs by passive diffusion. Only a small percentage of a high dose of thiamin is absorbed, and elevated serum values result in active urinary excretion of the vitamin.

Otten JJ, Hellwig JP, Meyers LD, eds; Dietary Reference Intakes: The Essential Guide to Nutrient Requirements, Washington, DC: The National Academies Press, 2006, p. 281


Thiamin is transported in blood in both erythrocytes and plasma and is excreted in the urine.

Otten JJ, Hellwig JP, Meyers LD, eds; Dietary Reference Intakes: The Essential Guide to Nutrient Requirements, Washington, DC: The National Academies Press, 2006, p.281


Thiamine is absorbed from the small intestine and is phosphorylated in the intestinal mucosa.

Furia, T.E. (ed.). CRC Handbook of Food Additives. 2nd ed. Cleveland: The Chemical Rubber Co., 1972., p. 89


The B vitamins are readily absorbed from the gastrointestinal tract, except in malabsorption syndromes. Thiamine is absorbed mainly in the duodenum.

USP Convention. USPDI-Drug Information for the Health Care Professional. 14th ed. Volume I. Rockville, MD: United States Pharmacopeial Convention, Inc., 1994. (Plus Updates)., p. 2647


For more Absorption, Distribution and Excretion (Complete) data for Vitamin B1 (8 total), please visit the HSDB record page.


5.4 Metabolism/Metabolites

Converted in vivo to thiamine diphosphate, a coenzyme in the decarboxylation of alpha-keto acids.

O'Neil, M.J. (ed.). The Merck Index - An Encyclopedia of Chemicals, Drugs, and Biologicals. Whitehouse Station, NJ: Merck and Co., Inc., 2006., p. 1598


Compound 3-(2'-methyl-4'-amino-5'-pyrimidylmethyl)-4-methylthiazole-5-acetic acid, ie thiamine acetic acid, 2-methyl-4-amino-5-formylaminomethylpyrimidine, and 5-(2-hydroxyethyl)-4-methylthiazole have been identified as important metabolites of thiamine, vitamin B1.

The Chemical Society. Foreign Compound Metabolism in Mammals. Volume 2: A Review of the Literature Published Between 1970 and 1971. London: The Chemical Society, 1972., p. 248


Biotransformation of thiamine in mammals is generally supposed to /yield/ thiochrome, thiamine disulfide, 5-(2-hydroxyethyl)-4-methyl-thiazole, and some form corresponding to pyrimidine residue of thiamine.

The Chemical Society. Foreign Compound Metabolism in Mammals. Volume 1: A Review of the Literature Published Between 1960 and 1969. London: The Chemical Society, 1970., p. 229


Thiamine is metabolized in the liver of animals. Several urinary metabolites of thiamine have been identified in humans. Little or no unchanged thiamine is excreted in urine following administration of physiologic doses; however, following administration of larger doses, both unchanged thiamine and metabolites are excreted after tissue stores become saturated.

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


5.5 Biological Half-Life

The biological half-life of the vitamin is in the range of 9-18 days.

Otten JJ, Hellwig JP, Meyers LD, eds; Dietary Reference Intakes: The Essential Guide to Nutrient Requirements, Washington, DC: The National Academies Press, 2006, p.281


With higher pharmacological levels, namely repetitive 250-mg amounts taken orally and 500 mg given intramuscularly, nearly 1 week was required for steady state plasma concentrations to be reached; a mean elimination half-life of 1.8 days was estimated.

NAS, Food and Nutrition Board, Institute of Medicine; Dietary Reference Intakes for Thiamin, Riboflavin, Niacin, Vitamin B6, Folate, Vitamin B12, Pantothenic Acid, Biotin, and Choline. National Academy Press, Washington, D.C., pg. 59, 1998. Available from, as of March 2, 2010: https://www.nap.edu/catalog/6015.html


Total thiamin content of the adult human has been estimated to be approximately 30 mg, and the biological half-life of the vitamin is probably in the range of 9 to 18 days.

NAS, Food and Nutrition Board, Institute of Medicine; Dietary Reference Intakes for Thiamin, Riboflavin, Niacin, Vitamin B6, Folate, Vitamin B12, Pantothenic Acid, Biotin, and Choline. National Academy Press, Washington, D.C., pg. 59, 1998. Available from, as of March 2, 2010: https://www.nap.edu/catalog/6015.html


5.6 Mechanism of Action

Metabolic control analysis predicts that stimulators of transketolase enzyme synthesis such as thiamin (vitamin B-1) support a high rate of nucleic acid ribose synthesis necessary for tumor cell survival, chemotherapy resistance, and proliferation. Metabolic control analysis also predicts that transketolase inhibitor drugs will have the opposite effect on tumor cells. This may have important implications in the nutrition and future treatment of patients with cancer.

PMID:10890024 Cascante M et al; Nutr Cancer 36 (2): 150-4 (2000).


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Virtual BoothFaran Shimi: Leading producer of high-quality APIs & alkaloid opiates, serving major pharmaceutical companies across the Middle East.

Vitamin B1 Mono

CAS Number : 59-43-8

End Use API :

About the Company : Faran Shimi Pharmaceutical Company, established in 2001 and affiliated with Golrang Pharmaceutical Investment Co, manufactures high-quality Active Pharmaceutical Ingredients (APIs) and ...

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Pluviaendo

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Vitamin B1 MONO

CAS Number : 59-43-8

End Use API :

About the Company : Pluvia Consumer Health is a multinational pharmaceutical company with its head office in Turkey/Istanbul & with unique molecules & know-how. Our portfolio contains several specific APIs...

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