8-[3-(p-Fluorobenzoyl)propyl]-2-methyl-2,8-diazaspiro[4.5]decane-1,3-dione | 8-[4-(4-fluorophenyl)-4-oxobutyl]-3-methyl-3,8-diazaspiro[4.5]decane-2,4-dione |
8-[4-(4-fluorophenyl)-4-oxo-butyl]-3-methyl-3,8-diazaspiro[4.5]decane-2,4-dione | 8-[4-(4-fluorophenyl)-4-keto-butyl]-3-methyl-3,8-diazaspiro[4.5]decane-2,4-quinone |