2-(4-chlorophenyl)-2-azaspiro[4.5]decane-1,3-dione

2-anilino-2-azaspiro[4.5]decane-1,3-dione

2-pyridin-2-yl-2-azaspiro[4.5]decane-1,3-dione

4-(1,3-dioxo-2-azaspiro[4.5]decan-2-yl)benzoic acid