Following is the structure of 2,4,6-Trichlorobenzenesulfonyl chloride (CAS NO.51527-73-2):
                    
Empirical Formula: C₆H₂Cl₄O₂S
Molecular Weight: 279.9559 g/mol
Molar Refractivity: 54.88 cm³
Molar Volume: 161.9 cm³
Density: 1.728 g/cm³
Flash Point: 160 °C
Index of Refraction: 1.593
Melting point: 44-48 °C(lit.)
Surface Tension: 51.3 dyne/cm
Enthalpy of Vaporization: 56.14 kJ/mol
Boiling Point: 341 °C at 760 mmHg
Vapour Pressure of 2,4,6-Trichlorobenzenesulfonyl chloride (CAS NO.51527-73-2): 0.000164 mmHg at 25 °C 
Product Categories of 2,4,6-Trichlorobenzenesulfonyl chloride (CAS NO.51527-73-2): Phenyls & Phenyl-Het; Sulphonyl Chlorides; Benzenesulfonyl chloride; Phenyls & Phenyl-Het; Sulphonyl Chlorides; Organic Building Blocks; Sulfonyl Halides; Sulfur Compounds
Sensitive of 2,4,6-Trichlorobenzenesulfonyl chloride (CAS NO.51527-73-2): Moisture Sensitive
SMILES: O=S(Cl)(=O)c1c(Cl)cc(Cl)cc1Cl
InChI: InChI=1/C6H2Cl4O2S/c7-3-1-4(8)6(5(9)2-3)13(10,11)12/h1-2H
InChIKey: WHJAQKAAIOHCGN-UHFFFAOYAT

Hazard Codes: C,F+
Risk Statements: 34 
R34:Causes burns.
Safety Statements: 26-36/37/39-45-39-37-36 
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. 
S36/37/39:Wear suitable protective clothing, gloves and eye/face protection. 
S45:In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) 
S39:Wear eye / face protection. 
S37:Wear suitable gloves. 
S36:Wear suitable protective clothing.
RIDADR: UN 3261 8/PG 2
WGK Germany: 3
Hazard Note: Corrosive/Moisture Sensitive
HazardClass: 8
PackingGroup: II

  2,4,6-Trichlorobenzenesulfonyl chloride , its cas register number is 51527-73-2. It also can be called Benzenesulfonyl chloride, 2,4,6-trichloro- ; and 2,4,6-Trichloro Benzenesulfonyl Chloride .