Molecular Structure of 3-Amino-4-hydroxypyridine (CAS NO.6320-39-4):

IUPAC Name: 3-amino-1H-pyridin-4-one 
Molecular Formula: C₅H₆N₂O
Molecular Weight: 110.11
CAS Registry Number: 6320-39-4
H bond acceptors: 3
H bond donors: 3
Freely Rotating Bonds: 1
Polar Surface Area: 23.55 Å²
Index of Refraction: 1.555
Molar Refractivity: 29.29 cm³
Molar Volume: 91.1 cm³
Surface Tension: 44.4 dyne/cm
Density: 1.208 g/cm³
Flash Point: 107.2 °C
Enthalpy of Vaporization: 49.1 kJ/mol
Boiling Point: 253.6 °C at 760 mmHg
Vapour Pressure: 0.0181 mmHg at 25°C
Melting point: 145-149°C
Product Categories: pharmacetical; Amines; Pyridines; Pyridine

Hazard Codes: Xi,Xn
Risk Statements: 36/37/38-40
R36/37/38:Irritating to eyes, respiratory system and skin. 
R40:Limited evidence of a carcinogenic effect.
Safety Statements: 22-26-36
S22:Do not breathe dust. 
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. 
S36:Wear suitable protective clothing.
Hazard Note: Irritant

  3-Amino-4-hydroxypyridine , with CAS number of 6320-39-4, can be called 3-Amino-4-pyridinol ; 3-amino-1H-pyridin-4-one ; 3-Aminopyridin-4-ol ; 3-Amino-pyridin-4-ol .