General Toolbar
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      | Rectangle Selection | Allows selection in rectangle mode on mouse drag. | 
|      | Lasso Selection | Allows selection in lasso mode on mouse drag. | 
|      | Structure Selection | Allows selection in structure selection mode on mouse drag. With this selection mode only whole fragments can be selected. | 
| 
      | Erase | Removes all structures upon selection. | 
|  | Undo | Reverses the last command or the last entry you typed. | 
|      | Redo | Reverses the action of the last Undo command. | 
|      | Cut | Removes and copies the selection to the clipboard. | 
|      | Copy | Copies the selection to the clipboard. | 
|      | Paste | Inserts the contents of the clipboard at the location of the cursor, without replacing selection. | 
|      | Check Structure | Checks and corrects chemical structures. See Structure Checker User's Guide for more details. | 
| 
      | Zoom In | Increases the canvas's magnification. | 
|      | Zoom Out | Decreases the canvas's magnification. | 
|      | Zoom Tool | Changes the canvas's magnification to a specific value. It can also do autoscale using named values: All, Selection. | 
|      | Help Contents | Shows MarvinSketch User's Guide. | 
 
         
         
         
         
         
         
         
         
         
         
         
        