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methyl-[(3aR)-2,2,5c,12-tetramethyl-11-oxo-8c-(toluene-4-sulfonyloxy)-(3ar,6at,7ac,9ac,12ac,12bt,13atO1)-decahydro-[1,3]dioxolo[3''',4''':3'',4'']pyrano[3'',2'':5',6'][1,4]dioxino[2',3':5,6]benzo[1,2-d]oxazol-9t-yl]-carbamic acid benzyl ester