When a molecule's summary dialog is displayed, pressing Ctrl+C will copy any user selected items to the systems clipboard.  To select items:

• Pressing Ctrl+A will select all items in the dialog
   
• An item in the dialog may be selected by clicking it with the left mouse button
   
• A range of items in the dialog may be selected pressing and holding the left mouse button
   
• Multiple sets of items may be selected by pressing the Ctrl key while selecting using the left mouse button