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Methyl (1'R,3'R,4S,5'S,7'S,9'S,12'R,19'S)-5',19'-dimethyl-2,16'-dioxospiro[1,3-dioxolane-4,6'-2-oxahexacyclo[9.8.0.01,3.05,10.07,9.014,19]nonadec-13-ene]-12'-carboxylate


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