Amaralin

(1aR,1bα,3aβ,6aα,8aβ)-1b,2,3,3a,6,6a,7,7a,8,8a-Decahydro-8β-hydroxy-2α,7aβ-dimethyl-6-methyleneoxireno[1,2]azuleno[6,5-b]furan-5(1aH)-one