N-chlorocarbonyl-N-methyl crotonamide 、 7-(D-α-aminophenylacetamido)-3-(5-methyl-1,3,4-thiadiazole-2-yl)thiomethyl-3-cephem-4-carboxylic acid 以38.8%的产率得到Sodium 7-[D-α-(3-crotonoyl-3-methylureido)phenylacetamido]-3-(2-methyl-1,3,4-thiadiazol-5-ylthio)methylceph-3-em-4-carboxylate