(3S,4R,5R)-5-(13-Benzyloxy-10-oxo-tridecyl)-3,4-dihydroxy-1-(4-methoxy-benzyl)-pyrrolidin-2-one

(2R,3R,4R,5R)-3,4-Dihydroxy-2-hydroxymethyl-5-{9-[2-(3-hydroxy-propyl)-[1,3]dioxolan-2-yl]-nonyl}-pyrrolidine-1-carboxylic acid tert-butyl ester

(3S,4R,5R)-3,4-Bis-benzyloxy-5-(13-benzyloxy-10-oxo-tridecyl)-pyrrolidin-2-one

(3S,4R,5R)-3,4-Bis-benzyloxy-5-{9-[2-(3-benzyloxy-propyl)-[1,3]dioxolan-2-yl]-nonyl}-pyrrolidin-2-one

(2R,3R,4S)-3,4-Bis-benzyloxy-2-{9-[2-(3-benzyloxy-propyl)-[1,3]dioxolan-2-yl]-nonyl}-5-oxo-pyrrolidine-1-carboxylic acid tert-butyl ester