Allantoin is an imidazolidine-2,4-dione that is 5-aminohydantoin in which a carbamoyl group is attached to the exocyclic nitrogen.
Chemical formula    C4H6N4O3
Molar mass              158.117 g·mol−1
Density            1.45 g/cm3
Melting point           230 °C (446 °F; 503 K) (decomposes)
Boiling point           478 °C (892 °F; 751 K)
Technical Analysis
Specification        Typical Values
Colour (APHA)          white
CAS NO.                97-59-6
IUPAC name N-(2,5-Dioxoimidazolidin-4-yl)urea
HS Code                  29157090
Solubility              0.57 g/100 mL (25 °C) 4.0 g/100 mL (75 °C)
Allantoin is an imidazolidine-2,4-dione that is 5-aminohydantoin in which a carbamoyl group is attached to the exocyclic nitrogen.