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(from merkindex)
Monograph Number:  6938
Title:  Ornidazole
CAS Registry Number:  16773-42-5
CAS Name:  a-(Chloromethyl)-2-methyl-5-nitro-1H-imidazole-1-ethanol
Additional Names:  1-(3-chloro-2-hydroxypropyl)-2-methyl-5-nitroimidazole
Manufacturers' Codes:  Ro-7-0207
Trademarks:  Madelen (Finadiet);  Ornidal (Selvi);  Tiberal (Roche)
Molecular Formula:  C7H10ClN3O3
Molecular Weight:  219.63.  
Percent Composition:  C 38.28%, H 4.59%, Cl 16.14%, N 19.13%, O 21.85%
Literature References:  Prepn:  NL 6606853; M. Hoffer, US 3435049 and US 3493582 (1966, 1969 and 1970, all to Hoffmann-La Roche).  Activity studies:  E. Grunberg et al., Proc. Soc. Exp. Biol. Med. 133, 490 (1970).  Synthesis and antiprotozoal activity:  M. Hoffer, E. Grunberg, J. Med. Chem. 17, 1019 (1974).  Pharmacokinetics:  D. E. Schwartz, F. Jeunet, Chemotherapy 22, 19 (1976).
Properties:  Crystals from toluene, mp 77-78?  uv max (2-propanol):  288, 312 nm (e 3720, 9150).  pKa:  2.4 ?0.1.  LD50 in rats, mice (mg/kg):  1780, 1420 orally (Grunberg).  Also reported as LD50 in mice (mg/kg):  >2000 orally, >2000 i.p. (Hoffer, Grunberg).
Melting point:  mp 77-78°
pKa:  pKa:  2.4 ?0.1
Absorption maximum:  uv max (2-propanol):  288, 312 nm (e 3720, 9150)
Toxicity data:  LD50 in rats, mice (mg/kg):  1780, 1420 orally (Grunberg); LD50 in mice (mg/kg):  >2000 orally, >2000 i.p. (Hoffer, Grunberg)
Therap-Cat:  Anti-infective.
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