Butanoicacid, 3-methyl-, dodecahydro-3-methyl-6,9-bis(methylene)-2-oxoazuleno[4,5-b]furan-8-ylester, [3S-(3a,3aa,6aa,8b,9aa,9bb)]-; Azuleno[4,5-b]furan, butanoic acid deriv.;Diaspanolide A
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