(2R,4S,6S)-4-Hydroxy-piperidine-1,2,6-tricarboxylic acid ethyl ester dimethyl ester

(2R,4S,6S)-2,6-Bis-hydroxymethyl-4-methoxymethoxy-piperidine-1-carboxylic acid ethyl ester

Methanesulfonic acid (5S,7R,8aR)-7-methanesulfonyloxy-3-oxo-hexahydro-oxazolo[3,4-a]pyridin-5-ylmethyl ester

((2R,6R)-1-Benzyl-6-methyl-piperidin-2-yl)-methanol

(5R,8aR)-5-Methyl-hexahydro-oxazolo[3,4-a]pyridin-3-one