4-Chloro-5,7-dihydro-2-methylthieno(3,4-d)pyrimidine 5719-46-0 EINECS 227-222-2 Thieno(3,4-d)pyrimidine, 4-chloro, 5,7-dihydro-2-methyl Thieno(3,4-d)pyrimidine, 4-chloro-5,7-dihydro-2-methyl-