Method 1: Labeling the last atom drawn

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1. Draw a bond by dragging the bond tool in the direction you want the bond oriented.

2. Type a HotKey.

The last atom drawn is labeled. Each time you draw a bond, the last atom drawn is the HotKey atom.

NOTE: When you are pointing, rather than drawing, the last atom highlighted is the atom labeled. Thus, if you click to create a bond and linger with the cursor over the origin, you will highlight the origin and it will be labeled rather than the last atom drawn.