9-methyl-3-(4-nitrophenyl)-3,9-diazaspiro[5.5]undecane
3-(3-chloro-4,5-dimethoxybenzoyl)-9-methyl-3,9-diazaspiro[5.5]undecane trifluoroacetic acid salt
3-[(3-fluoro-4-methoxyphenyl)acetyl]-9-methyl-3,9-diazaspiro[5.5]undecane trifluoroacetic acid salt
3-(3-chloro-4-methoxybenzoyl)-9-methyl-3,9-diazaspiro[5.5]undecane trifluoroacetic acid salt
N-(3-chloro-4-methoxyphenyl)-9-methyl-3,9-diazaspiro[5.5]undecane-3-carboxamide trifluoroacetic acid salt