5H-[1]Benzopyrano[4,3-b]pyridine-3-carboxylic acid, 2-(ethylamino)-5-oxo-, methyl ester (en)

methyl 2-cyano-3-(4-methylphenyl)prop-2-enoate

methyl 5-p-tolyl-2H-1,2,3-triazole-4-carboxylate

4-环己基-2-巯基-6-氧代-1,6-二氢嘧啶-5-甲腈

3-氧代戊酸甲酯