A cephalosporin compound of the formula: ##STR1## wherein R.sup.1 is hydrogen or lower alkyl; R.sup.2 is acetoxy or (1-methyl-1H-tetrazol-5-yl)thio, and R.sup.3 is carboxy; or R.sup.2 is a group of the formula ##STR2## R.sup.3 is --COO.sup.- and Y is hydrogen, hydroxymethyl or carbamoyl; and n is an integer of 2 or 3, or a pharmaceutically acceptable salt thereof and processes for their preparation are disclosed. Said cephalosporin compound is useful as an antimicrobial agent.
一种
头孢菌素化合物的公式:##
STR1##其中R.sup.1是
氢或较低的烷基;R.sup.2是乙酰
氧基或(
1-甲基-1H-四唑-5-基)
硫基,R.sup.3是羧基;或者R.sup.2是公式##
STR2##的基团,R.sup.3是--COO.sup.-,Y是
氢,
羟甲基或
氨基甲酰基;n是2或3的整数,或其药学上可接受的盐,以及它们的制备方法。该
头孢菌素化合物可用作抗微
生物剂。