(2R,3S)-2-(2-Benzyloxy-ethyl)-3-hydroxy-2-methyl-succinic acid diethyl ester

(2S,3R)-5-benzyloxy-3-ethoxycarbonyl-2-hydroxy-3-methylpentanoic acid

(3S,4R)-3-methoxymethyloxy-4-methyl-4-vinyl-γ-butyrolactone