Not Less Than - 95%
3,3-Pentamethylene Glutarimide; 2,4-Dioxo-3-azaspiro[5.5]undecane; 3-Azaspiro[5.5]undecane-2,4-dione; 9-azaspiro[5.5]undecane-8,10-dione; 4,4-Pentamethylene-2-pyrrolidinone