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methyl-((3aR)-2,2,5c,10-tetramethyl-9-oxo-(3ar,6at,7ac,7bt,12at,13atO1)-4,5,7a,7b,9,10,12,12a-octahydro-3aH-[1,3]dioxolo[4''',5''':3'',4'']pyrano[3'',2'':5',6'][1,4]dioxino[2',3':3,4]benzo[1,2-d]oxazol-12t-yl)-carbamic acid benzyl ester