α-(2-carbo-tert.-butyloxy-3,3-dimethyl-7-oxo-4-thia-2,6-diaza-6-bicyclo[3,2,0]heptyl)-α-hydroxy-acetic acid 2,2,2-trichloroethyl ester 以
二氯甲烷 、
三氟乙酸 为溶剂,
生成 α-(3,3-dimethyl-7-oxo-4-thia-2,6-diaza-6-bicyclo[3,2,0]heptyl)-α-hydroxy-acetic acid 2,2,2-trichloroethyl ester