Substructure
-     
Checker searches for SMARTS defined substructures. Substructure Checkers can be set individually.
 -     
Fixer: when the substructure is specified as reaction SMARTS or SMIRKS, the checker works as fixer as well.
 
Example :
| 
         Substructure Checker  | 
                
         Warning:  | 
                
         Fix  | 
        
| 
         O=N=O>>[O-][N+]=O  | 
        ||
| 
         Checker setting: SMARTS: O=N=O>>[O-][N+]=O  | 
                
               | 
                
               | 
        
Note     
: You can rename "substructure checker" in Structure Checker GUI. Click on the name field of the configured checker and rename it by typing a new name. For example, you can name it as Nitro Checker.