22721-36-4 3-Amino-2-methyl-3,5,6,7-tetrahydro-4H-cyclopenta(4,5)thieno(2,3-d)pyrmidin-4-one 4H-Cyclopenta(4,5)thieno(2,3-d)pyrimidin-4-one, 3,5,6,7-tetrahydro-3-amino-2-methyl- BRN 3033965