ethyl rel(4R,7aS)-1,2,3,4,7,7a-hexahydro-4-methyl-6-oxo-6H-2-pyrindin-2-carboxylate

ethyl 3-oxo-2,6-dihydropyridine-1-carboxylate

ethyl 3-hydroxy-3-methyl-1,2,3,6-tetrahydropyridine-1-carboxylate

ethyl 5-methyl-3-(2-oxoethyl)-1,2,3,6-tetrahydropyridine-1-carboxylate

ethyl 3-(2-hydroxypropyl)-5-methyl-1,2,3,6-tetrahydropyridine-1-carboxylate