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[(1'R,4R,5'R,6'S,10'R,11'R,12'R,13'S)-13'-Hydroxy-2,2,11',15',18',18'-hexamethyl-3'-oxo-10'-phenylmethoxyspiro[1,3-dioxolane-4,7'-2,4-dioxatetracyclo[12.3.1.01,5.06,11]octadeca-8,14-diene]-12'-yl] (1S,4R)-4,7,7-trimethyl-3-oxo-2-oxabicyclo[2.2.1]heptane-1


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