User guide

Figure 15.4: The racemic flag indicates a mixture of the exact stereoisomer as drawn and its enantiomer.
Polymer representations
Polymers are represented by brackets used to enclose repeated structures or structural fragments. Bracket properties
specify the orientation and context of the repeating units. For an explanation of the bracket properties, see "Setting
bracket properties" on page 213.
Note: The polymer drawing feature is available only in ChemBioDraw Ultra 13.0, and ChemDraw Pro 13.0.
References
“Graphic Representations (Chemical Formulae) of Macromolecules (Recommendations 1994)” Pure Appl. Chem., 66,
2469-2482 (1994).
“Source-Based Nomenclature for Copolymers (Recommendations 1985)” Pure Appl. Chem., 57, 1427-1440 (1985).
Also available at: http://www.iupac.org/publications/books/pbook/PurpleBook-C7.pdf.
“Basic Definitions of Terms Relating to Polymers (1974)” Pure Appl. Chem., 40, 479-491 (1974) Also available at:
http://www.iupac.org/reports/1996/6812jenkins/index.html.
Also see the Guide for the authors of papers and reports in polymer science and technology from IUPAC.
Analysis messages
When a structure cannot be fully analyzed, two general types of messages are displayed:
Status messages that report a problem that may not affect the final analysis
Critical messages that may affect the final analysis
Message Description
There are too many bonds to this
unlabeled Carbon.
Displayed for every unlabeled atom with more than four filled valences.
ChemBioDraw 13.0
Chapter 15: Chemical interpretation 298 of 401