(E)-(4R,6R)-4,8-Bis-benzyloxy-6-methyl-oct-2-enoic acid ethyl ester

(2S,3S,4R,6R)-4,8-Bis-benzyloxy-2,3-dihydroxy-6-methyl-octanoic acid ethyl ester

(2R,3R,5S,8R,10S)-2-((1R,3R)-1,5-Dihydroxy-3-methyl-pentyl)-3-hydroxy-8,10-dimethyl-1-oxa-6-aza-spiro[4.5]decane-6-carboxylic acid tert-butyl ester

(2R,3R,5S,8R,10S)-2-((1R,3R)-5-Acetoxy-1-hydroxy-3-methyl-pentyl)-3-hydroxy-8,10-dimethyl-1-oxa-6-aza-spiro[4.5]decane-6-carboxylic acid tert-butyl ester

(2S,3R,5S,8R,10S)-2-((1R,3R)-1,5-Bis-benzyloxy-3-methyl-pentyl)-3-hydroxy-8,10-dimethyl-1-oxa-6-aza-spiro[4.5]decane-6-carboxylic acid tert-butyl ester