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[(1'S,4S,5'S,6'R,10'S,11'S,13'R)-2,2,11',15',18',18'-Hexamethyl-3',12'-dioxo-10'-phenylmethoxyspiro[1,3-dioxolane-4,7'-2,4-dioxatetracyclo[12.3.1.01,5.06,11]octadeca-8,14-diene]-13'-yl] acetate


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