| 摘要 |
New cephalosporins, useful as antibacterial agents, have the formula <IMAGE> including its amino tautomer form wherein R is hydrogen, sodium, potassium, t-butyl, benzyl, p- methoxybenzyl, p-nitrobenzyl, diphenylmethyl, 2,2,2-trichloroethyl, trimethylsilyl, <IMAGE> R1 is in the alpha -configuration and is hydrogen or methoxy; R2 is hydrogen, <IMAGE> R3 is hydrogen of lower alkyl; X is hydrogen, <IMAGE> R4 is hydrogen or lower alkyl; R5 is hydrogen, lower alkyl, <IMAGE> R6 is hydrogen, sodium or potassium; and n is an integer from 1 to 4. |
