User guide

When Display Warnings is disabled for an object:
A red box does not appear around the object.
Problems are reported by the Check Structure command (Go to Structure>Check Structure).
To view a description of the problem, do one of the following:
Point at the warning with the mouse to display a tool tip that describes the error.
Right-click the warning and choose Explain This Warning.
Select the structure and go to Structure>Check Structure.
Warning preferences
To select which types of chemical warnings to display:
1. Go to File>Preferences.
2. Click the Warnings tab.
3. Select the types of warnings and click OK.
The types of warnings are listed below:
Warning Description
Valence and Charge
Errors
An Object drawn has an improper valence or charge. For example, when a positive and
negative charges have been assigned to the same element, charges have been assigned
in more than one way, or a charge has been assigned to a nickname, generic nickname, or
alternative group name.
Unbalanced Paren-
theses
Parentheses are not matched into nested open-close pairs.
Invalid Isotopes
Generated for invalid isotopes. For example, this warning is generated for every label that
has a numeric superscript immediately preceding an atomic symbol, where the super-
scripted number does not correspond to a recognized isotope. For example,
24
CH
3
.
Isolated Bonds An unlabeled single bond is not attached to other bonds.
Atoms Near Other
Bonds
An atom is close to a bond but not attached to it.
Unspecified Stereo
Chemistry
An asymmetric center is without attached wedged, hashed, dashed, or bold bonds.
Ambiguous Ster-
eochemistry
A stereocenter where the absolute stereochemistry cannot be determined from the struc-
ture as drawn. For example, this warning would be generated for a carbon atom attached
by bold bonds to four different ligands.
Stereobond between
Chiral Atoms
A stereobond connects two stereocenters.
ChemBioDraw 13.0
Chapter 3: Basic drawings 49 of 401