(E)-(4R,5S)-4-Benzyloxy-5-hydroxy-hex-2-enoic acid (S)-2-((E)-(1S,2R)-2-benzyloxy-4-methoxycarbonyl-1-methyl-but-3-enyloxycarbonyl)-1-methyl-ethyl ester

(E)-(4R,5S)-4-Benzyloxy-5-[(S)-3-(tert-butyl-dimethyl-silanyloxy)-butyryloxy]-hex-2-enoic acid methyl ester

(E)-(4R,5S)-4-Benzyloxy-5-(tert-butyl-dimethyl-silanyloxy)-hex-2-enoic acid (S)-2-((E)-(1S,2R)-2-benzyloxy-4-methoxycarbonyl-1-methyl-but-3-enyloxycarbonyl)-1-methyl-ethyl ester

(E)-(4R,5S)-4-Benzyloxy-5-hydroxy-hex-2-enoic acid (S)-1-methyl-2-(2,2,2-trichloro-ethoxycarbonyl)-ethyl ester

(E)-(4R,5S)-4-Benzyloxy-5-(tert-butyl-dimethyl-silanyloxy)-hex-2-enoic acid (S)-1-methyl-2-(2,2,2-trichloro-ethoxycarbonyl)-ethyl ester