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(1S,2S,6S,7S,9R,11R,15R,19S,20S)-9-Ethenyl-7,9,13,13,18,18,19-heptamethyl-3,5,8,12,14-pentaoxapentacyclo[9.7.2.02,6.07,20.015,19]icosan-4-one


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