tert-Butyl 2-methyl-2-(5-methyl-2,4-dioxo-1,4-dihydrothieno[2,3-d]pyrimidin-3(2H)-yl)propanoate 1g

tert-Butyl 2-methyl-2-(5-methyl-2,4-dioxo-1,4-dihydrothieno[2,3-d]pyrimidin-3(2H)-yl)propanoate 1g