Fluorene
(1R,4S,4aS,4bS,5R,8S,8aR,9aR)-4,4a,4b,5,8,8a,9,9a-octahydro-1H-1,4:5,8-dimethanofluorene
(1S,11S)-1,3,4,5,6,7,9,9aβ-Octahydro-2α,11-dihydroxy-1β-methyl-10-methylene-13-oxo-4aα,1-(epoxymethano)-4bβ,7β-ethano-2H-fluorene-9β-carboxylic acid
(1S,2S,3aR,4R,4aS,4bS,6R,8S,8aS,9aR,10R,10aR)-Dodecahydro-2,4a,6,9a-tetramethylcyclopenta[b]fluorene-1,3a,4,6,8,8a,10(1H,4H)-heptol 4,8,8a,10-tetraacetate 1-benzoate
(3s,3'r,3a's,6's,6as,6bs,7a'r,9r,11as,11br)-3-hydroxy-3',4',4',6',10-pentamethyl-11-oxo-1,2,3,3a',4,4',5',6,6',6a,6b,7,7',7a',8,11,11a,11b-octadecahydro-3'h-spiro[benzo[a]fluorene-9,2'-furo[3,2-b]pyridin[4]ium] iodide
(3s,3as,5as,5br,10bs)-3-hydroxy-3,3a,5b-trimethylspiro[2,4,5,5a,6,7,10a,10b-octahydro-1h-cyclopenta[a]fluorene-10,1'-cyclopropane]-8-one