Spiro[azuleno[4,5-b]furan-3(2H),10'-[4H-6a,9]ethanoazuleno[4,5-b]furan]-2,2'(3'H)-dione, 4-(acetyloxy)-3a,3'a,4,5,5',6,6',6a,7,9',9a,9'a,9b,9'b-tetradecahydro-6,6'-dihydroxy-6,6',9,9'-tetramethyl-3'-methylene-
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