(6R,7R)-7-(2-Chloro-acetylamino)-3-methyl-4-methylene-8-oxo-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid benzhydryl ester 、
重氮甲烷 生成 benzhydryl (6'R,7'R)-7'-[(2-chloroacetyl)amino]-3'-methyl-8'-oxospiro[3,4-dihydropyrazole-5,4'-5-thia-1-azabicyclo[4.2.0]oct-2-ene]-2'-carboxylate