6,7-Dihydroxy-4-oxo-4H-1-benzopyran-3-carboxylic acid chloride 、
1-(4-溴苯基)-N-乙基甲磺酰胺 生成 (6R,7R)-3-(acetyloxymethyl)-7-[[(2R)-2-[(6,7-dihydroxy-4-oxochromene-3-carbonyl)amino]-2-(4-hydroxyphenyl)acetyl]amino]-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid