(2'R,7R,8S,9S,10R,11R,13S,14S)-Methyl 11-hydroxy-10,13-dimethyl-3,5'-dioxo-1,2,3,4',5',6,7,8,9,10,11,12,13,14,15,16-hexadecahydro-3'H-spiro[cyclopenta[a]phenanthrene-17,2'-furan]-7-carboxylate

5'-Bromospiro[cyclopentane-1,3'-indoline]

1-Oxa-9-azaspiro[5.5]undecane hydrochloride

3-Oxa-9-azaspiro[5.5]undecane

3-Oxa-9-azaspiro[5.5]undecane hydrochloride

2,2'-Dibromo-9,9'-spirobi[fluorene]

3-(tert-Butoxycarbonyl)-3-azaspiro[5.5]undecane-9-carboxylic acid

9-Benzyl-2,9-diazaspiro[5.5]undecane dihydrochloride

2,9-Diazaspiro[5.5]undecan-1-one hydrochloride

9-Benzyl-3,9-diazaspiro[5.5]undecane-2,4-dione