tert-Butyl (4as,7ar)-4-(2-methoxy-2-oxoethyl)hexahydrothieno[3,4-b]pyrazine-1(2h)-carboxylate 6,6-dioxide 1g

tert-Butyl (4as,7ar)-4-(2-methoxy-2-oxoethyl)hexahydrothieno[3,4-b]pyrazine-1(2h)-carboxylate 6,6-dioxide 1g