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

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

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

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

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