| abstract |
Acylated 7-amino-cephalosporanic acid derivs as antibiotics and animal feed additives 7-R1-acetyl-amino - 3 -R2CH2-DELTA3cephem-4-carboxylic acid derivs where R1-5-amino-tetraazole and R2=H, OH, acylated OH or its S-analogs, opt. -substd. carbamoyloxy or its S-analogs or a quaternary amino group and their internal salts are new compounds prepd. by acylating the 7-amino group, with R1CH2COOH or its deriv or reacting 5-amino-tetrazole with a haloacetylated 7-amino cephalosporanic acid. |