ethyl 4-methyl-3-oxopyrido[2,3-b]pyrazine-2-carboxylate

3-氧代-3,4-二氢-2-喹喔啉甲酸乙酯

ethyl 4-methyl-3-oxoquinoxaline-2-carboxylate

甘油

丙二酸二乙酯