4-氯-6,7-二氢-5H-环戊并嘧啶-2-胺

2-氨基-6,7-二氢-5H-环戊[d]嘧啶-4-醇

2-氧代环戊羧酸乙酯

2-amino-1,5,6,7-tetrahydrocyclopenta[d]pyrimidine-4-thione

2-oxocyclopentane-1-carbaldehyde