IUPAC Name: 2,3-Dimethoxy-5-sulfamoylbenzoic acid 
Following is the structure of 2,3-Dimethoxy-5-sulphamoylbenzoic acid (CAS NO.66644-80-2):
                           
Empirical Formula: C₉H₁₁NO₆S
Molecular Weight: 261.2517 g/mol
EINECS: 266-433-4
Index of Refraction: 1.564
Molar Refractivity: 58.19 cm³
Molar Volume: 178.9 cm³
Density: 1.46 g/cm³
Flash Point: 255.7 °C
Melting point: 206 °C
Surface Tension: 56.5 dyne/cm
Enthalpy of Vaporization: 80.83 kJ/mol
Boiling Point: 499.2 °C at 760 mmHg
Vapour Pressure of 2,3-Dimethoxy-5-sulphamoylbenzoic acid (CAS NO.66644-80-2): 8.76E-11 mmHg at 25 °C
Product Categories of 2,3-Dimethoxy-5-sulphamoylbenzoic acid (CAS NO.66644-80-2): Organic acids
Canonical SMILES: COC1=C(C(=CC(=C1)S(=O)(=O)N)C(=O)O)OC
InChI: InChI=1S/C9H11NO6S/c1-15-7-4-5(17(10,13)14)3-6(9(11)12)8(7)16-2/h3-4H,1-2H3,(H,11,12)(H2,10,13,14)
InChIKey: YEVQOPOKMKTXMD-UHFFFAOYSA-N

 2,3-Dimethoxy-5-sulphamoylbenzoic acid , its cas register number is 66644-80-2. It also can be called 5-Aminosulfonyl-2,3-dimethoxy benzoic acid ; and Benzoic acid, 5-(aminosulfonyl)-2,3-dimethoxy- .