3b,4,15-trihydroxy-1,4,5a,13,13-pentamethyltetradecahydro-2H,10H-7a,16a-epoxy-3,9,12,17-tetraoxacyclopenta[3',3a']azuleno[6',5':5,6]cycloocta[1,2,3-cd]-as-indacene-2,5,10,16(1H,8H,13H)-tetrone
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