5,7-Dihydro-2-methylthieno(3,4-d)pyrimidin-4-ol 5719-23-3 EINECS 227-221-7 Thieno(3,4-d)pyrimidin-4(1H)-one, 5,7-dihydro-2-methyl- Thieno(3,4-d)pyrimidin-4-ol, 5,7-dihydro-2-methyl-