Spiro
(1aR,3S,7aR)-1aβ,2,3bβ,4,5,6,6aβ,7-Octahydro-2α,7α-dihydroxy-4β-octanoyloxy-3aα,5,5-trimethylspiro[cyclopenta[4,5]pentaleno[1,6a-b]oxirene-3(3aH),2-oxirane]
(1aR,5aR,7aS,8R,10cR)-5a,7a-dimethyl-1,1a,3',4,4',5,5a,5b,6,7,7a,9,10,10a,10b,10c-hexadecahydro-3H,5'H-spiro[cyclopenta[a]cyclopropa[l]phenanthrene-8,2'-furan]-3,5'-dione
(1aR,5R)-2α-Acetoxy-1aβ,2,3,3a,4,7bβ-hexahydro-3α,3,3,3aα-tetramethylspiro[naphth[1,2-b]oxirene-5(6H),2-oxiran]-6-one
(1aS,3R,5aR,5bS,7aS,8R,10aS,10bR,10cR)-3-hydroxy-5a,7a-dimethyl-1a,3,3',4,4',5,5a,5b,6,7,7a,9,10,10a,10b,10c-hexadecahydro-5'H-spiro[cyclopenta[1,2]phenanthro[9,10-b]oxirene-8,2'-furan]-5'-one
(1aS,3S,5aR,5bS,7aS,8R,10aS,10bR,10cR)-3-hydroxy-5a,7a-dimethyl-1a,3,3',4,4',5,5a,5b,6,7,7a,9,10,10a,10b,10c-hexadecahydro-5'H-spiro[cyclopenta[1,2]phenanthro[9,10-b]oxirene-8,2'-furan]-5'-one
(1aS,5aR,5bS,7aS,8R,10aS,10bR,10cR)-5a,7a-dimethyl-4,5,5a,5b,6,7,7a,9,10,10a,10b,10c-dodecahydro-3'H-spiro[cyclopenta[1,2]phenanthro[9,10-b]oxirene-8,2'-furan]-3,5'(1aH,4'H)-dione
(1aS,7S,7aR,8S)-1a,1b,5,6,6a,7a-Hexahydro-1bα,6β-dihydroxy-6aα-methyl-8-(1-methyl-1-hydroxyethyl)spiro[2α,5α-methano-7H-oxireno[3,4]cyclopent[1,2-d]oxepine-7,2'-oxiran]-3(2H)-one