203808-35-9 3-Butyl-5,6-dimethyl-1-(phenylmethyl)thieno(2,3-d)pyrimidine-2,4(1H,3H)-dione Thieno(2,3-d)pyrimidine-2,4(1H,3H)-dione, 3-butyl-5,6-dimethyl-1-(phenylmethyl)-