diphenylmethyl (6R,7S)-7-carboxycarbonylamino-7-methoxy-3-carbamoyloxymethyl-3-cephem-4-carboxylate

5-benzylidene-1,3-diphenylimidazolidine-2,4-dione

N,N'-bis(phenyl)-2-thioxoimidazolidine-4,5-dione

2-hydroxy-1,3-diphenylimidazolidine-4,5-dione

异氰酸苯酯