28-acetyl-A-nor-3-aza-5β,22R,25R-spirosolane

28-acetyl-A-nor-aza-22R-25R-spirosol-3-ene

28-acetyl-22R,25R-spirosolan-4-en-3-one

28-acetyl-A-nor-3,5-seco-5-keto-22R,25R-spirosolan-3-oic acid

(4R,4aS,5'R,6aS,6bR,7S,8R,9aS,10aS,10bS)-1'-acetyl-4-(2-isocyanatoethyl)-4,5',6a,7-tetramethyldodecahydrospiro[benzo[4,5]indeno[2,1-b]furan-8,2'-piperidin]-3(2H)-one

3-((4R,4aS,5'R,6aS,6bR,7S,8R,9aS,10aS,10bS)-1'-acetyl-4,5',6a,7-tetramethyl-3-oxotetradecahydrospiro[benzo[4,5]indeno[2,1-b]furan-8,2'-piperidin]-4-yl)propanoyl azide