User guide

Figure 11.9: Defining an alternative group
Specify where the fragments should bond to the parent structure on the alternative group label by defining attachment
Points.
1. Do one of the following:
Select the diamond shaped Attachment Point tool on the Chemical Symbols palette (View>Other
Toolbars>Chemical Symbols), and click a substructure fragment where you want to place the attachment point.
Point to a substructure fragment where you want to place the attachment point and press the hotkey “.” (period).
An attachment point symbol appears.
2. Repeat for all fragments.
Figure 11.10: Adding attachment points. An attachment point symbol has been applied to the nitrogen atom.
When you create a structure that contains an alternative group, an attachment point symbol appears next to the label.
The attachment point number matches that found in the definition.
Figure 11.11: Structure with R-group table
The number displayed in the attachment point symbol is the attachment rank order. See the example in "Multiple
attachment points" on page 220.
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Chapter 11: Query structures 219 of 401