[1,2-c]furan
(1R)-1α-Hydroxy-6,6,9aβ-trimethyl-4,5,5aα,6,7,8,9,9a-octahydronaphtho[1,2-c]furan-3(1H)-one
(1R)-5bβ,8,8,11aβ,13aβ-Pentamethyl-13α-acetoxy-1,3,5,5aα,5b,6,7,7aα,8,9,10,11,11a,11bα,12,13,13a,13bα-octadecahydrochryseno[1,2-c]furan-1α-ol
(1R)-6,6,9aβ-Trimethyl-1,3,5,5aα,6,7,8,9,9a,9bα-decahydronaphtho[1,2-c]furan-1α-ol
(1R)-7-methoxy-11a-methyl-1,3,3a,3b,4,5,9b,10,11,11a-decahydrophenanthro[1,2-c]furan-1-ol
(1R,5aR,7R,8R,9aS,9bR)-1-hydroxy-6,6,9a-trimethyl-1,3,5,5a,6,7,8,9,9a,9b-decahydronaphtho[1,2-c]furan-7,8-diyl (2E,2'E)bis(2-methylbut-2-enoate)
(1S,3aR,4R,5R,5aR,7S,9S,9aS,10R,11S,11aR)-Tetradecahydro-9α,10β,11α-triacetoxy-5β,7β,11aα-trihydroxy-1,3aα,9aα-trimethyl-6-methylene-1β,4β-ethanobenzo[5,6]cycloocta[1,2-c]furan-13-one
(2S,4aR,4bS,10bR)-2-hydroxy-1,1,4a,7,10a-pentamethyl-7-(4-methylpentyl)octadecahydro-9H-naphtho[2',1':4,5]indeno[1,2-c]furan-9-one
(2S,4aR,4bS,6aS,12aS,12bR)-4a,6a-dimethyl-9,11-dioxo-2,3,4,4a,4b,5,6,6a,8,8a,9,11,11a,11b,12,12a,12b,13-octadecahydro-1H-naphtho[1',2':7,8]fluoreno[1,2-c]furan-2,7-diyl diacetate
(3bS,4aS,5aS,6R,6aR,7aS,7bS,8aS,8bS)-6-hydroxy-6a-(1-hydroxy-1-methylethyl)-8b-methyl-3b,4,4a,6,6a,7a,7b,8b,9,10-decahydrotrisoxireno[6,7:8a,9:4b,5]phenanthro[1,2-c]furan-1(3H)-one