[2S-(2alpha,5alpha,6alpha)]-6-溴-3,3-二甲基-7-氧代-4-硫杂-1-氮杂双环[3.2.0]庚烷-2-羧酸

6-氨基青霉烷酸

benzhydryl-3-methyl-7-oxo-3-(1H-1,2,3-triazol-1-ylmethyl)-4- thia-1-azabicyclo[3.2.0]heptane-2-carboxylate

2-oxo-4-(benzothiazol-2-yl)dithio-α-isopropenyl-1-azetidine acetic acid benzhydryl ester

diphenylmethyl 6α-bromopenicillanate