ChemDraw User's Manual - CambridgeSoft

Am Amyl AmericiumNp para-NeptuniumNitrophenylPr Propyl PraeseodymiumTo remove the overriding Nicknames, choose ListNicknames from the File menu and delete theoverriding Nickname definition. For moreinformation, see “Deleting Nicknames” on page124.Troubleshooting NicknamesIf the command Define Nicknames is dimmed,check for the following:• A connection point is not present• More than 2 connection points are defined• The connection point is not a single bondIn the example below, the functional group wasdrawn and the entire group selected. Because thereis no atom that indicates a connection point, youcannot define a Nickname.You must leave a bond unselected for eachconnection point. You cannot define more thantwo connection points or one attachment point ona single atom in a nickname.incorrect definitionscorrect definitionsThe definition in the figure below wasused for the amino acid, Ala. The unselected bondat each end of the structure indicates theconnection points—Nitrogen on the left andCarbon on the right.In the example below, the sulfonamide group isattached to an unselected bond, which defines abond from sulfur as the connection point for thegroup. This allows you to define a Nickname.You can draw a peptide chain by:• Stringing Nicknames together.H Gly Ala OH• Stringing Nicknames together in an atom labelas long as there is a bond attached.HGlyAlaOHChemDraw 9 Advanced Drawing Techniques • 123Using Nicknames