5-ethoxy-2-ethylmercapto-3H-pyrimidin-4-one

4,5-diaminopyrimidin-2(1H)-one

硫酸

6-羟基二氢-2,4,5(3H)-嘧啶三酮

5-氨基-6-硫氧代二氢嘧啶-2,4(1H,3H)-二酮