ethyl 5-acetyl-4-methyl-1H-pyrrole-3-carboxylate

ethyl 4-methyl-2-phenylpyrimidine-5-carboxylate

Ethyl 7-methyl-2-phenylpyrazolo[1,5-a]pyrimidine-6-carboxylate

4-甲基-2-吗啉-4-嘧啶-5-羧酸

ethyl 2-(hydroxymethylidene)-3-oxobutanoate