203808-44-0 3-Benzyl-5,6-dimethylthieno(2,3-d)pyrimidin-2,4(1H,3H)dione-1-acetic acid Thieno(2,3-d)pyrimidine-1(2H)-acetic acid, 3,4-dihydro-5,6-dimethyl-2,4-dioxo-3-(phenylmethyl)-