Synonyms: 2-mercapto-3-(2-phenylethyl)-3,5,6,7-tetrahydro-4H-cyclopenta[4,5]thieno[2,3-d]pyrimidin-4-one;3-(2-Phenylethyl)-2-sulfanyl-3,5,6,7-tetrahydro-4H-cyclopenta[4,5]thieno[2,3-d]pyrimidin-4-one;4H-Cyclopenta[4,5]thieno[2,3-d]pyrimidin-4-one, 3,5,6,7-tetrahydro-2-mercapto-3-(2-phenylethyl)-