2-((1S,3R,6S)-10-(tert-butoxycarbonyl)-3-methyl-5,14-dioxo-10-azaspiro[5.8]tetradecan-1-yl)acetic acid

tert-butyl (1R,3R,5S,6R)-1-allyl-5-hydroxy-3-methyl-14-oxo-10-azaspiro[5.8]tetradecane-10-carboxylate

tert-butyl (7aS,8R,9aS,11R,13R,13aR)-7a,8,13-trihydroxy-11-methyldodecahydro-1H-indeno[1,7a-e]azonine-4(5H)-carboxylate

(7aS,8R,9aS,11R,13R,13aR)-4-(tert-butoxycarbonyl)-7a-hydroxy-11-methyltetradecahydro-1H-indeno[1,7a-e]azonine-8,13-diyl diacetate

tert-butyl (1S,3R,5R,6R)-1-(2-hydroxyethyl)-3-methyl-14-oxo-5-((trimethylsilyl)oxy)-10-azaspiro[5.8]tetradecane-10-carboxylate