3-carboxymethoxymethyl-1,2,4-triazole-5-thiol 、 3-acetoxymethyl-7-(D-α-tert.-butoxycarbonylamino-p-hydroxyphenylacetamido)ceph-3-em-4-carboxylic acid 在
盐酸 、
sodium hydroxide 作用下,
生成 7-(D-α-tert.-butoxycarbonylamino-p-hydroxyphenylacetamido)-3-(3-carboxymethoxymethyl-1,2,4-triazol-5-yl)thiomethylceph-3-em-4-carboxylic acid