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[(1'S,4S,5'S,6'R,10'S,11'S,12'S,13'R)-2,2,11',13',15',15'-Hexamethyl-3',14'-dioxo-10'-phenylmethoxyspiro[1,3-dioxolane-4,7'-2,4-dioxatetracyclo[11.2.2.01,5.06,11]heptadec-8-ene]-12'-yl] formate


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