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[(2R,3S,3aR,4aS,7R,8aS,9S,9aR)-3,9-Diacetoxy-2-(2-trityloxy-ethyl)-decahydro-furo[3,2-b]pyrano[2,3-e]pyran-7-yl]-acetic acid methyl ester
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[(2R,3S,3aR,4aS,7R,8aS,9S,9aR)-3,9-Diacetoxy-2-(2-oxo-ethyl)-decahydro-furo[3,2-b]pyrano[2,3-e]pyran-7-yl]-acetic acid methyl ester