(6R-反式)-3-(羟基甲基)-8-氧代-7-(2-噻吩基乙酰氨基)-5-硫杂-1-氮杂双环[4.2.0]辛-2-烯-2-羧酸 、
2,2,2-trichloroethoxycarbonyl isocyanate 生成 (6R,7R)-8-oxo-7-[(2-thiophen-2-ylacetyl)amino]-3-(2,2,2-trichloroethoxycarbonylcarbamoyloxymethyl)-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid