4-oxathiane-2,6-dione 、
7-β-amino-7-α-methoxy-3-[(1-methyl-tetrazol-5-yl)-thiomethyl]-ceph-3-em-4-carboxylic acid diphenylmethyl ester 生成 2-[2-[[(6R,7R)-2-benzhydryloxycarbonyl-7-methoxy-3-[(1-methyltetrazol-5-yl)sulfanylmethyl]-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-en-7-yl]amino]-2-oxoethyl]sulfanylacetic acid