Claims for Patent: 4,935,507

Summary for Patent: 4,935,507

Title:	Crystalline 7-(2-(2-aminothiazol-4-yl)-2-hydroxyiminoacetamido)-3-vinyl-3-cephem-4-c arboxylic acid (syn isomer)
Abstract:	The invention relates to crystalline 7-[2-(2-aminothiazol-4-yl)-2-hydroxyiminoacetamido]-3-vinyl-3-cephem-4-car boxylic acid (syn isomer) useful as an antimicrobial agent.
Inventor(s):	Takaya; Takao (Kawanishi, JP), Shirai; Fumiyuki (Ikeda, JP), Nakamura; Hitoshi (Mino, JP), Inaba; Yasunobu (Toyonaka, JP)
Assignee:	Fujisawa Pharmaceutical Co., Ltd. (Osaka, JP)
Application Number:	07/229,489
Patent Claims:	1. Crystalline 7-[2-(2-aminothiazol-4-yl)-2-hydroxyiminoacetamido]-3-vinyl-3-cephem.-4-ca rboxylic acid (syn isomer) which shows the peaks at the diffraction angles shown in the following table in its powder X-ray diffraction pattern: 2. Crystalline 7-[2-(2-aminothiazol-4-yl)-2-hydroxyiminoacetamido]-3-vinyl-3-cephem-4-car boxylic acid (syn isomer) which is obtainable by acidifying a solution containing 7-[2-(2-aminothiazol-4-yl)-2-hydroxyiminoacetamido]-3-vinyl-3-cephem-4-car boxylic acid (syn isomer) at room temperature or under warming. 3. Crystalline substance of claim 2, wherein a solution containing 7-[2-(2-aminothiazol-4-yl)-2-hydroxyiminoacetamido]-3-vinyl-3-cephem-4-car boxylic acid (syn isomer) is an aqueous solution of an alkali metal salt of said compound. 4. Crystalline substance of claim 3, wherein the acidifying of the solution is carried out at the temperature from room temperature to 40.degree. C. at the pH from 1 to 4. 5. Crystalline 7-[2-(2-aminothiazol-4-yl)-2-hydroxyiminoacetamido]-3-vinyl-3-cephem-4-car boxylic acid (syn isomer) which is obtainable by dissolving 7-[2-(2-aminothiazol-4-yl)-2-hydroxyiminoacetamido]-3-vinyl-3-cephem-4-car boxylic acid (syn isomer) in an alcohol, continuing to stir the solution slowly under warming, then cooling the solution to room temperature and allowing the solution to stand.