6-(Methoxymethyl)-2-sulfanylidene-2,3-dihydropyrimidin-4(1H)-one175205-07-9100 % similar 4-Hydroxy-6-methoxymethyl-2-methylpyrimidine38249-50-244 % similar 4-Amino-6-hydroxy-2-mercaptopyrimidine monohydrate65802-56-441 % similar