Molecular Formula: C₇H₆O₃
Molecular Weight: 138.12 
EINECS: 247-479-4 
Index of Refraction: 1.674
Molar Refractivity: 36.76 cm³
Molar Volume: 97.9 cm³
Surface Tension: 69 dyne/cm
Density: 1.409 g/cm³
Flash Point: 164.1 °C
Enthalpy of Vaporization: 58.88 kJ/mol
Boiling Point: 324.3 °C at 760 mmHg
Vapour Pressure: 0.000131 mmHg at 25 °C
Melting point: 153-158 °C(lit.)
Appearance: White to tan to grey crystalline powder
Structure of 3,5-Dihydroxybenzaldehyde (CAS NO.26153-38-8):
                           
IUPAC Name: 3,5-Dihydroxybenzaldehyde
Canonical SMILES: C1=C(C=C(C=C1O)O)C=O
InChI: InChI=1S/C7H6O3/c8-4-5-1-6(9)3-7(10)2-5/h1-4,9-10H
InChIKey: HAQLHRYUDBKTJG-UHFFFAOYSA-N
Product Category of 3,5-Dihydroxybenzaldehyde (CAS NO.26153-38-8): Aromatic Aldehydes & Derivatives (substituted);Benzaldehyde;Carbonyl Compounds

 3,5-Dihydroxybenzaldehyde (CAS NO.26153-38-8) can used as reagent for organic synthesis.

Hazard Codes of 3,5-Dihydroxybenzaldehyde (CAS NO.26153-38-8):  Xi (Irritant)
Risk Statements: 36/37/38
R36/37/38:Irritating to eyes, respiratory system and skin.
Safety Statements: 22-24/25-37/39-26 
S22:Do not breathe dust. 
S24/25:Avoid contact with skin and eyes. 
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. 
S37/39:Wear suitable gloves and eye/face protection.
WGK Germany: 3

Assay: 98% min

 3,5-Dihydroxybenzaldehyde , its cas register number is 26153-38-8. It also can be called Benzaldehyde, 3,5-dihydroxy- ; and .alpha.-Resorcylic aldehyde . It should be stored in cool, dry place in tightly closed containers.