异氰酸苯酯

1,2-bis(N-phenylcarbamoyl)-4-phenylurazole

4-phenyl-1-(tetrahydro-2-furanyl)-1,2,4-triazolidine-3,5-dione

N-苯基香豆甲酯

1-(3-hydroxy-2,3-dimethylbutan-2-yl)-4-phenyl-1,2,4-triazolidine-3,5-dione