(1S,2S,4R,7S,10R,11S,14S,15S)-2,4,15-trimethyl-5-oxotetracyclo[8.7.0.02,7.011,15]heptadecan-14-yl propanoate
(1S,2S,4R,7S,10R,11S,14S,15S)-2,4,15-trimethyl-5-oxotetracyclo[8.7.0.0^{2,7}.0^{11,15}]heptadecan-14-yl propanoate
(1S,3aS,3bR,5aS,8R,9aS,9bS,11aS)-8,9a,11a-trimethyl-7-oxo-hexadecahydro-1H-cyclopenta[a]phenanthren-1-yl propanoate