S-4,5-O-isopropylidene-4,5-dihydroxy-2-ethoxycarbonylpentanoic acid ethyl ester

(4S)-4-[tert-butyl(dimethyl)silyl]oxypentyl 4-methylbenzenesulfonate

(2S)-5-trityloxypentan-2-ol

(1R,2S,4S)-2-ethynyl-4-(2-methoxyethoxymethoxy)-1-cyclopentylmethyl benzyl ether

(1R,2S,4S)-4-(2-methoxyethoxymethoxy)-2-vinyl-1-cyclopentylmethyl benzyl ether