1-(2-吡啶)-1H-吡唑-4-羧酸乙酯

2-甲基-5-嘧啶甲酸乙酯

呋喃并[3,2-b]吡啶-6-羧酸乙酯

ethyl 2-(methoxymethyl)pyrazolo[1,5-a]pyrimidine-6-carboxylate

ethyl 1-(2-hydroxyethyl)pyrazole-4-carboxylate