Synonyms: [1]Benzothieno[2,3-d]pyrimidin-4(1H)-one, 2,3,5,6,7,8-hexahydro-2-thioxo-;[1]Benzothieno[2,3-d]pyrimidin-4(3H)-one, 5,6,7,8-tetrahydro-2-mercapto-;[1]benzothieno[2,3-d]pyrimidin-4-ol, 5,6,7,8-tetrahydro-2-mercapto-;2-Sulfanyl-5,6,7,8-tetrahydro[1]benzothieno[2,3-d]pyrimidin-4(3H)-one;2-Thioxo-2,3,5,6,7,8-hexahydro[1]benzothieno[2,3-d]pyrimidin-4(1H)-one