(trans-racemic) 1-tert-Butyl 3-methyl 4-(5,6-dimethoxypyridin-3-yl)pyrrolidine-1,3-dicarboxylate(trans-Racemic) 1-tert-Butyl 3-methyl 4-(5,6-di-methoxypyridin-3-yl)pyrrolidine-1,3-dicarboxylate(trans-racemic) 1-tert-Butyl 3-methyl 4-(5,6-dimethoxypyridin-3-yl)pyrrolidine-1,3-dicarboxylate