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(1'S,4S,5'S,6'R,10'S,11'S,12'R,15'R,16'S)-14'-Hydroxy-2,2,11',16',19',19'-hexamethyl-10'-phenylmethoxyspiro[1,3-dioxolane-4,7'-2,4,13-trioxapentacyclo[13.3.1.01,5.06,11.012,16]nonadec-8-ene]-3'-one


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