7-羟基香豆素-3-羧酸乙酯

2-oxo-4,6-diphenylpyran-3-carbonitrile

ethyl 2-amino-5-(4-fluorophenyl)thiophene-3-carboxylate

ethyl 2-cyano-2-methylsulfonylacetate

4-氨基-2-氰基亚氨基-6-羟基嘧啶