3-Hydroxymethyl-7-methoxy-7-(2-thienylacetamido)-3-cephem-4-carboxylic acid 、
2,2,2-trichloroethoxycarbonyl isocyanate 、 以3-carbamoyloxymethyl-7-methoxy-7-(2-thienylacetamido)-3-cephem-4-carboxylic acid is obtained的产率得到3-Carbamoyloxymethyl-7-methoxy-7-(2-thienylacetamido)-3-cephem-4-carboxylic acid