ethyl 2-chloro-3-((R)-2,2-dimethyl-1,3-dioxolan-4-yl)-3-hydroxypropanoate

(3R,4S,5R)-(4-hydroxy-5-hydroxymethyl-2-oxotetrahydrofuran-3-yl)carbamic acid benzyl ester

(2S,3R)-3-((R)-2,2-Dimethyl-[1,3]dioxolan-4-yl)-oxirane-2-carboxylic acid ethyl ester

(2R,3S)-2-Amino-3-((R)-2,2-dimethyl-[1,3]dioxolan-4-yl)-3-hydroxy-propionic acid

[(3R,4S,5R)-4-(Isopropyl-dimethyl-silanyloxy)-5-(isopropyl-dimethyl-silanyloxymethyl)-2-oxo-tetrahydro-furan-3-yl]-carbamic acid benzyl ester