Markush Toolbar
This toolbar contains funtions that help to work with Markush structures and it is not visible by default.
To make it visible, choose View > Toolbars > Markush.    
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         Position Variation Bond  | 
                
         Creates a variable point of attachment to represent a connection point to a group of atoms.  | 
        
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         Frequency Variation  | 
                
         Creates a Repeating Unit with Repetition Ranges.  | 
        
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         R-group attachment  | 
                
         Adds an attachment to the structure.  |