The antibacterial agent 7-[D-.alpha.-amino-.alpha.-(p-hydroxyphenyl)acetamido]-3-(1,2,3-triazol-5- ylthiomethyl)-3-cephem-4-carboxylic acid, which is a zwitterion, is both purified and converted to a form highly suitable for use in aqueous suspensions by converting it to the crystalline 7-[D-.alpha.-amino-.alpha.-(p-hydroxyphenyl)acetamido]-3-(1,2,3-triazol-5- ylthiomethyl)-3-cephem-4-carboxylic acid 1,2-propylene glycolate, said propylene glycolate containing 1.0 - 1.6 moles of 1,2-propylene glycol per mole of cephalosporin zwitterion.
                            这种抗菌剂7-[D-.alpha.-
氨基-.alpha.-(对羟基苯基)乙酰
氨基]-3-(
1,2,3-三唑-5- ylthiomethyl)-3-头孢烷-4-
羧酸,是一种带电离子,通过将其转化为结晶的7-[D-.alpha.-
氨基-.alpha.-(对羟基苯基)乙酰
氨基]-3-(
1,2,3-三唑-5- ylthiomethyl)-3-头孢烷-4-
羧酸1,2-丙二醇酸盐,可使其纯化并转化为适用于
水悬浮液的形式,所述的
丙二醇酸盐中每摩尔
头孢菌素带电离子含有1.0-1.6摩尔的
1,2-丙二醇。