diethyl 2-[(4-nitroanilino)methylidene]propanedioate

diethyl 2-(ethylaminomethylidene)propanedioate

diethyl 2-[(cyclohexylamino)methylidene]propanedioate

6-溴-1,4-二氢-4-氧代-3-喹啉羧酸乙酯

1,4-二氢-6-甲基-4-氧代-3-喹啉羧酸乙酯