203808-34-8 3-Benzyl-5,6-dimethylthieno(2,3-d)pyrimidin-2,4(1H,3H)-dione 5,6-Dimethyl-3-(phenylmethyl)thieno(2,3-d)pyrimidine-2,4(1H,3H)-dione Thieno(2,3-d)pyrimidine-2,4(1H,3H)-dione, 5,6-dimethyl-3-(phenylmethyl)-