7,8-dihydro-2-(4-methyl-1-piperidinyl)-4-(1-pyrrolidinyl)-6H-thiopyrano(3,2-D)pyrimidine-2-butenedioate
7,8-dihydro-2-(4-methyl-1-piperidinyl)-4-(1-pyrrolidinyl)-6h-thiopyrano(3,2-d)pyrimidine-2-butenedioate