User guide

A successful search in one database might not produce results in another. When in doubt, consult the documentation
for the conventions your database uses.
Bond conventions
The following table describes the chemical conventions ChemBioDraw 13.0 recognizes.
Bond Description
Single bond, unspecified stereo-chemistry.
Single bond, “down” stereochemistry (into the plane of the paper, away from the viewer), from
the first drawn atom to the second drawn atom.
Single bond, “up” stereochemistry (out of the plane of the paper, toward the viewer), from the
first drawn atom to the second drawn atom.
Single bond, mixture of “up” and “down” stereochemistries in some unspecified proportion.
Dative bond. Often used to indicate polar bonds, such as the N-O bond in pyridine N-oxide.
Double bond, with cis/trans stereochemistry as drawn.
Double bond, with cis/trans stereochemistry unknown.
Tautomeric bond, either single or double according to rules of tautomerism.
Aromatic bond, part of a delocalized resonance system.
Triple bond.
Quadruple Bond.
Wedged bond/Hollow wedged bond, specifies stereochemistry up from the point
end to the wide end.
ChemBioDraw 13.0
Chapter 15: Chemical interpretation 289 of 401