Furan
4,7-Epoxycyclobut[f]isobenzofuran-5,6-dicarboxylicacid, 1,3,3a,4,4a,6a,7,7a-octahydro-1,3-dioxo-
Furo[3,2-b]naphtho[1,2-d]furan-3,9(2H,8H)-dione,8-ethyldecahydro-4,4,6a,10c-tetramethyl-, (4aR,6aR,7aS,8S,10aS,10bS,10cS)-
2-Methyl-2-butenoic acid 2,3,3a,4,5,5a,6,9b-octahydro-3,5a,9-trimethyl-2,6-dioxonaphtho[1,2-b]furan-3-yl ester
(13S,17R)-21,23-Epoxy-4,5α,5,6β-tetrahydro-4β,8-dimethyl-24-norchola-5-eno[6,5,4-bc]furan-14,20,22-triene-1α,3α,7α-triol 1,7-bis[(E)-2-methyl-2-butenoate]
Spiro[furan-2(3H),7'(4'H)-[1H,3H-3a,8b]methanobenzo[1,2-b:3,4-c']difuran]-1'-one,4-(2,5-dihydro-2-methyl-5-oxo-2-furanyl)-3'-(3-furanyl)-4,5,5',5'a-tetrahydro-5,5-dimethyl-,[3'R-[3'a,3'aa,5'aa,7'b[S*(S*)],8'ba]]-