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  • (3a'S,4S,8'R,9a'S,10'S,13a'R,13b'S)-10'-(benzyloxy)-2,2,6',9a',14',14'-hexamethyl-2',9'-dioxo-4',5',8',9',9a',10',13a',13b'-octahydrospiro[[1,3]dioxolane-4,13'-[3a,7]methanobenzo[3,4]cyclodeca[1,2-d][1,3]dioxol]-8'-yl acetate

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