5b-hydroxy-2,2,13b,13c-tetramethyl-10-(3-methylbut-2-en-1-yl)-2,3,5b,6,7,7a,8,13,13b,13c,14,15-dodecahydro-4H-3,15a-epoxy[1]benzoxepino[6',7':6,7]indeno[1,2-b]indol-4-one
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