benzyl 3-ethyl-3-(2-ethylenedioxyethyl)-1,2,3,6-terahydropyridine-1-carboxylate

(+/-)-N-Carbobenzoxy-3-hydroxy-1,2,3,6-tetrahydropyridine

benzyl 1,6-dihydro-3(2H)-oxopyridine-1-carboxylate

benzyl 5-ethyl-3-hydroxy-1,2,3,6-tetrahydropyridine-1-carboxylate

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