2-氰基壬酸乙酯

2-氨基-5-苯基-1H-吡咯-3-羧酸乙酯

2-(Diphenylacetylamino)-3-ethoxycarbonyl<2,3-b>quinuclidine

2,6-diamino-1-methylpyrimidin-4-one

2,4-二氨基-6-羟基嘧啶