Tolyltriazole (TTA, or TT)
  Molecular formula: C7H7N3 Molecular weight: 133.15  CAS NO: 29385-43-1;    
Structural formula: 
  
 
  
  
1,2,3-Benzotriazole( Benzotriazole, BTA, or BT) 
Molecular formula:  C6H5N3 
Molecular weight: 119.13 
CAS NO: 95-14-7 
Structural formula:  
  
  
 5-methylbenzotriazole (5-MBT, 5-methyl BT) 
Chemical formula: C7H7N3  Molecular weight: 133.15 
CAS NO: 136-85-6 
Structural formula: 
  
  
  
5-n-butylbenzotriazole (butylbenzotriazole, BBT) 
Chemical formula:  C10H13N3 
Molecular weight:  175.23 
CAS NO: 16-27-00 
Structural formula:  
  
  
  
  
Isatoic anhydride (IA) 
Chemical formula: C8H5NO3 
Molecular weight: 163.13 
CAS NO: 118-48-9 
Structural formula:  
  
  
  
2,6-Di-tert-butyl-4-methylphenol (BHT, IONOL CP) 
Chemical formula: C15H24O 
Molecular weight: 220.35 
CAS NO: 128-37-0 
Structural formula: 
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