1,2-O-isopropylidene-3-O-allyl-5-O-triphenylmethyl-α-D-xylofuranoside

(3'S,4'R) 1,2-O-isopropylidene-3-O-(3'-methyl-azetidin-2'-on-4'-yl)-5-O-trityl-α-D-xylofuranose