105523-02-2 2-Thio-3-phenyl-4-oxo-5-methylthieno(2,3-d)pyrimidine-6-acetic acid ethyl ester BRN 5618087 Thieno(2,3-d)pyrimidine-6-acetic acid, 1,2,3,4-tetrahydro-5-methyl-4-oxo-3-phenyl-2-thioxo-, ethyl ester