(2R,3R,4S,5R)-4-benzyloxy-5-(1,3-dithian-2-yl)-3-hydroxy-2-trityloxymethyltetrahydrofuran

((3aS,4S,5aR,5bS,9aR,10aR,10bR)-2,2,7,7-Tetramethyl-octahydro-1,3,5,6,8,10-hexaoxa-cyclopenta[a]fluoren-4-yl)-acetic acid ethyl ester