(9S,10S,12S,13S,14Z,19S,20R)-9,10,12,13-tetrahydroxy-4,19-dimethyl-20-{(2R,3S)-3-[(1S)-1-methylbutyl]oxiran-2-yl}-8,11,17-trimethylideneoxacycloicosa-3,5,14-trien-2-one
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