ethyl 7a-methoxy-2,2-dimethyl-6-oxo-3,7-dihydrofuro[2,3-b]pyridine-3a-carboxylate

3a-O-ethyl 4-O-methyl 7a-methoxy-6-oxo-3,7-dihydro-2H-furo[2,3-b]pyridine-3a,4-dicarboxylate

1,4-dimethoxy-1-methyl-4-propan-2-ylcyclohexane

1-Isopropyl-1,4-dimethoxy-4-methyl-cyclohexane