Molecular Formula: C₇H₆O₃
Molecular Weight: 138.12
EINECS:246-398-1
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: 113.2 °C
Enthalpy of Vaporization: 49.62 kJ/mol
Boiling Point: 240 °C at 760 mmHg
Vapour Pressure: 0.0252 mmHg at 25 °C
Melting point: 104-108 °C(lit.)
Sensitive: Air sensitive
Appearance: Light yellow to beige-greenish cryst. powder
Structure of 2,3-Dihydroxybenzaldehyde (CAS NO.24677-78-9):
                       
IUPAC Name: 2,3-Dihydroxybenzaldehyde
Canonical SMILES: C1=CC(=C(C(=C1)O)O)C=O
InChI: InChI=1S/C7H6O3/c8-4-5-2-1-3-6(9)7(5)10/h1-4,9-10H
InChIKey: IXWOUPGDGMCKGT-UHFFFAOYSA-N
Product Category of 2,3-Dihydroxybenzaldehyde (CAS NO.24677-78-9): Aromatic Aldehydes & Derivatives (substituted);Benzaldehyde;Carbonyl Compounds

 2,3-Dihydroxybenzaldehyde (CAS NO.24677-78-9) can be used as pharmaceutical intermediate, and is also used as an organic reagent.

 2,3-Dihydroxybenzaldehyde (CAS NO.24677-78-9) hasn't been listed as a carcinogen by NTP, IARC, ACGIH, or CA Prop 65. And the toxicological properties have not been fully investigated.

Hazard Codes: Xi
Risk Statements: 36/37/38
36/37/38:Irritating to eyes, respiratory system and skin
Safety Statements: 26-36-37/39
26:In case of contact with eyes, rinse immediately with plenty of water and seek medical advice 
36:Wear suitable protective clothing
37/39:Wear suitable gloves and eye/face protection
WGK Germany: 3
F: 10-23
F10: Keep under argon
F23: Sensitive to air
HS Code: 29124900

 2,3-Dihydroxybenzaldehyde , its cas register number is 24677-78-9. It is hazardous, so the first aid measures and others should be known. Such as: When on the skin: first, should flush skin with plenty of water immediately for at least 15 minutes while removing contaminated clothing. Secondly, get medical aid. Or in the eyes: Flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Then get medical aid soon. While, it's inhaled: Remove from exposure and move to fresh air immediately. Give artificial respiration while not breathing. When breathing is difficult, give oxygen. And as soon as to get medical aid. Then you have the ingesting of the product: Wash mouth out with water, and get medical aid immediately. Notes to physician: Treat supportively and symptomatically.
In addition, 2,3-Dihydroxybenzaldehyde (CAS NO.24677-78-9) could be stable under normal temperatures and pressures. It is not compatible with strong oxidizing agents, strong bases, acid chlorides, acid anhydrides, and you must not take it with incompatible materials. And also prevent it to broken down into hazardous decomposition products: Carbon monoxide, carbon dioxide.