Chemical Name: (2,5-Dioxo-4-imidazolidinyl ) urea Molecular Formula: C4H6N4O3 Molecular Weight: 158.12 1,Chemical Name: Allantoin (2,5-Dioxo-4-imidazolidinyl ) urea2,Molecular Formula: C4H6N4O3 3,Molecular Weight: 158.12 4,CAS#97-59-65,Physical and Chemical Properties:White crystalline powder; slight soluble in water, very slightly soluble in alcohol and aether, soluble in hot water, hot alcohol ...