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(1'R,3'R,4S,5'S,8'R,12'R,19'S)-12'-[(Z)-Methoxyiminomethyl]-5',19'-dimethylspiro[1,3-dioxolane-4,6'-2-oxaheptacyclo[9.8.0.01,3.05,10.07,9.08,10.014,19]nonadec-14-ene]-2,16'-dione


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