105523-01-1 3,4-Dihydro-5-methyl-4-oxothieno(2,3-d)pyrimidine-6-acetic acid 4-Oxo-5-methylthieno(2,3-d)pyrimidine-6-acetic acid BRN 5547954 Thieno(2,3-d)pyrimidine-6-acetic acid, 3,4-dihydro-5-methyl-4-oxo-