User guide

Message Description
Part of a molecule is outside of the
alternative group definition.
Displayed for any Alternative Group Box whose border crosses part of a
structure. This is a status message only.
This isolated bond is probably not
intended to have chemical sig-
nificance.
Displayed for unlabeled single bonds unattached to other bonds. All bonds
are interpreted chemically, usually as C
2
H
6
, and may cause unexpected
results if intended as a graphical line only. This is a status message only.
The atom is very close to another
atom or bond.
Displayed for any atom that is nearly touching another atom or bond but not
bound to it. If a bond really was intended, the analysis of the structure
produces incorrect results. This is s status message only.
The stereocenter has no ster-
eobonds specified.
Displayed for any asymmetric center without attached wedged, hashed,
dashed, or bold bonds. This is a status message only, and appears only
when Show Stereochemistry is tuned on and there is at least one other
wedged, hashed, dashed, or bold bond in the structure.
There is a valence and charge error
somewhere in this aromatic sys-
tem.
Displayed for any odd-membered ring drawn as a delocalized system (with
a circle in the middle), where there is no corresponding associated charge.
For example, a delocalized representation of cyclopentadiene must include
either a negative charge or a multicenter attachment.
The stereocenter has conflicting or
ambiguous stereobonds specified.
Displayed for any stereocenter (tetrahedral atom, asymmetric double bond,
etc.) where the absolute stereochemistry cannot be determined from the
structure as drawn. For example, this message would be shown for a car-
bon atom attached by bold bonds to four different ligands. This message is
displayed only when Show Stereochemistry is also turned on.
This label has an unrecognized iso-
topic mass.
Displayed for every label that has a numeric superscript immediately pre-
ceding an atomic symbol, where the superscripted number does not cor-
respond to a recognized isotope. For example,
24
CH
3
.
ChemBioDraw 13.0
Chapter 15: Chemical interpretation 300 of 401