(6R,7R)-7-[[(2S)-2-amino-2-thiophen-2-ylacetyl]amino]-3-[(1-methyltetrazol-5-yl)sulfanylmethyl]-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid 、
2,3-dioxo-4-[(phenylmethylene)-amino]-1-piperazinecarbonyl chloride 生成 (6R,7R)-7-[[(2S)-2-[[4-[(E)-benzylideneamino]-2,3-dioxopiperazine-1-carbonyl]amino]-2-thiophen-2-ylacetyl]amino]-3-[(1-methyltetrazol-5-yl)sulfanylmethyl]-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid