4-amino-2-methylthio-5,6-trimethylenepyrimidine

环戊酮

2-氧代环戊羧酸乙酯

2-甲基-2-疏基硫酸脲

1,2,3,5,6,7-六氢-2-硫氧代-4H-环戊并嘧啶-4-酮