[4,5-b]furan
(2E)-2-({[(3aR,4R,6R,6aS,7R,9aR,9bR)-7-(acetyloxy)-9-methyl-3-methylidene-2-oxo-3,3a,4,5,6a,7,9a,9b-octahydro-2H-spiro[azuleno[4,5-b]furan-6,2'-oxiran]-4-yl]oxy}carbonyl)but-2-en-1-yl (2E)-2-(hydroxymethyl)but-2-enoate
(2R,3a'R,4'R,6a'S,7'S,7a'R,8a'S,8b'S,8c'S)-7'-hydroxy-8a'-methyl-3'-methylidene-2'-oxodecahydro-2'H-spiro[oxirane-2,6'-oxireno[2,3]azuleno[4,5-b]furan]-4'-yl (2Z)-4-(acetyloxy)-2-methylbut-2-enoate
(3aR)-3aβ,4,5,7,7aα,8a,8bβ,8cα-Octahydro-4β-hydroxy-6,8aα-dimethyl-3-methyleneoxireno[2,3]azuleno[4,5-b]furan-2(3H)-one
(3aR)-4β,8α-Diacetoxy-3aβ,4,5,6,6aβ,7,8,9,9aβ,9bα-decahydro-3,6,9-trismethyleneazuleno[4,5-b]furan-2(3H)-one
(3aR,4aS,6aS,9aS,9bR)-7-(Dimethylaminomethyl)-1,4a-dimethyl-5,6,6a,7,9a,9b-hexahydro-3H-oxireno[8,8a]azuleno[4,5-b]furan-8(4aH)-one hydrochloride
(3aR,4R,7aR,8aS,8bS,8cS)-6-(hydroxymethyl)-8a-methyl-3-methylidene-2-oxo-2,3,3a,4,5,7,7a,8a,8b,8c-decahydrooxireno[2,3]azuleno[4,5-b]furan-4-yl (2Z)-2-methylbut-2-enoate
(3aR,4S,6aR,7R,8S,9S,9aS,9bS)-9-(chloromethyl)-7,8,9-trihydroxy-3,6-dimethylidene-2-oxododecahydroazuleno[4,5-b]furan-4-yl 2-methylprop-2-enoate