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4-Amino-6-hydroxy-2-mercaptopyrimidine monohydrate65802-56-4100 % similar 6-(Methoxymethyl)-2-sulfanylidene-2,3-dihydropyrimidin-4(1H)-one175205-07-941 % similar 6-Amino-2-hydroxypyridine5154-00-735 % similar 4,6-Diaminopyrimidin-2(1H)-one31458-45-432 % similar 6-Amino-3-methyl-1,2,3,4-tetrahydropyrimidine-2,4-dione21236-97-530 % similar