methyl 3-(4-oxo-1-phenyl-1,3,8-triazaspiro[4.5]decan-3-yl)benzoate

tert-butyl 2-(4-oxo-8-(4-oxo-4-phenylbutyl)-1-phenyl-1,3,8-triazaspiro[4.5]decan-3-yl)benzoate

tert-butyl 2-(4-oxo-1-phenyl-1,3,8-triazaspiro[4.5]decan-3-yl)benzoate

tert-butyl 4-(4-oxo-8-(4-oxo-4-phenylbutyl)-1-phenyl-1,3,8-triazaspiro[4.5]decan-3-yl)benzoate

tert-butyl 4-(4-oxo-1-phenyl-1,3,8-triazaspiro[4.5]decan-3-yl)benzoate