(6R,7R)-7-[[2-amino-2-(1,3-thiazol-4-yl)acetyl]amino]-3-[(1-methyltetrazol-5-yl)sulfanylmethyl]-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid 、
4-oxo-4H-thiopyran-3-carboxylic acid N-hydroxysuccinimide ester 生成 (6R,7R)-3-[(1-methyltetrazol-5-yl)sulfanylmethyl]-8-oxo-7-[[2-[(4-oxothiopyran-3-carbonyl)amino]-2-(1,3-thiazol-4-yl)acetyl]amino]-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid