(6R)-3-methyl-7c-(4-nitro-benzylideneamino)-8-oxo-(6rH)-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid methyl ester 生成 (6
R)-3-methyl-7ξ-(4-nitro-benzylideneamino)-8-oxo-(6
rH)-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid methyl ester