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R-Group
R-Group is one of the speedbuttons on the drawing palette. This option will enable you to add substituents at essentially any level of complexity to a molecule in one step. R-Groups may be changed and created at will; see the Files topic. To check the currently active R-Group, pause the cursor over the speedbutton. The active R=Group will be included in the popup 'hint' that displays.
To add an R-Group to a compound, simply click on the R-Group button to select it, and then click on the attachment atom of the target molecule and draw out a short bond. Note that you cannot simply click on the attachment atom in this case, you must manually draw a bond away from the parent molecule to the desired location.