IUPAC Name: 1,3-diazinane-2,4,6-trione 
Empirical Formula: C₄H₄N₂O₃
Molecular Weight: 128.0862g/mol
EINECS: 200-658-0 
Structure of Barbituric acid (CAS NO.67-52-7):

Melting Point: 248-252 °C (dec.)(lit.)
Boiling Point: 260 °C 
Flash Point: 150 °C
Water Solubility: 142 g/L (20 ºC)
Index of Refraction: 1.492
Molar Refractivity: 25.53 cm³
Molar Volume: 88 cm³
Polarizability: 10.12×10^-24cm³
Surface Tension: 48.7 dyne/cm
Density: 1.455 g/cm³ 
Product Categories: Pharmaceutical Intermediates;PYRIMIDINE;Miscellaneous Biochemicals;Pyrimidine series 
Canonical SMILES: C1C(=O)NC(=O)NC1=O
InChI: InChI=1S/C4H4N2O3/c7-2-1-3(8)6-4(9)5-2/h1H2,(H2,5,6,7,8,9)
InChIKey: HNYOPLTXPVRDBG-UHFFFAOYSA-N

 Barbituric acid (CAS NO.67-52-7) was discovered by the German chemist Adolf von Baeyer on 4. December 1864—the feast of St Barbara and therefore the name given to the compound—by combining urea and malonic acid in a condensation reaction. and The first to be used in medicine was barbital (Veronal) starting in 1903, and the second, phenobarbitone a.k.a. phenobarbital was first marketed in 1912.

  Barbituric acid (CAS NO.67-52-7) is used in synthesis of riboflavin.

Risk Statements: 36/37/38
R36/37/38:Irritating to eyes, respiratory system and skin.
Safety Statements: 24/25
S24/25:Avoid contact with skin and eyes.
WGK Germany: 1
RTECS: CP8000000
HS Code: 29335200

  Barbituric acid , its cas register number is 67-52-7. It also can be called 2,4,6(1H,3H,5H)-Pyrimidinetrione ; 2,4,6-Pyrimidinetriol ; 2,4,6-Pyrimidinetrione ; 2,4,6-Trihydroxypyrimidine ; 2,4,6-Trioxohexahydropyrimidine ; 6-Hydroxyuracil ;
 Hydrouracil, 6-hydroxy- ; Malonylurea  ; Pyrimidinetriol ; Pyrimidinetrione ; Urea, N,N'-(1,3-dioxo-1,3-propanediyl)- . Barbituric acid (CAS NO.67-52-7) is a cream coloured fine crystalline powder.