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(1S,4R,6R,7S,11S,12S,16S,20R)-4-Ethenyl-4,6,13,13,18,18,20-heptamethyl-5,8,10,17,19-pentaoxapentacyclo[10.7.1.01,6.07,11.016,20]icosane-2,9-dione


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