2-Methoxyimino-2-(1,2,3-thiadiazol-4-yl)acetic acid 、
7-amino-3-[1-[2-(N,N-dimethylamino)ethyl]-1H-tetrazol-5-yl]thiomethyl-3-cephem-4-carboxylic acid 以to give 7-[2methoxyimino-2-(1,2,3-thiadiazol-4-yl)acetamido]-3-[1-(2-dimethylaminoethyl)-1H-tetrazol-5-yl]thiomethyl-3-cephem-4-carboxylic acid (syn isomer) (230 mg.)的产率得到7-[2methoxyimino-2-(1,2,3-thiadiazol-4-yl)acetamido]-3-[1-(2-dimethylaminoethyl)-1H-tetrazol-5-yl]thiomethyl-3-cephem-4-carboxylic acid