Chemical name:  | 4-Nitrotoluene-2-Sulphonic Acid  | 
Structural formula:  | 	  | 
Molecular formula:  | C7H7NO5S  | 
Molecular weight :  | 217.1992  | 
CAS number :  | 121-03-9  | 
Application:  | |
It is an intermediates for direct dyestuff .  | |
Specification:
Appearance  | Light white crystals  | 
Assay  | 80% (Reduction of zinc powder)  | 
Free Acid  | 3.0%  | 
Loss on drying  | 0.1%  |