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Stereochemical Specification
R-7.1.0 cis-trans Isomerism - the E/Z Convention (Introduction) 
Stereoisomers that differ only in the positions of atoms relative to a specified plane in cases where these atoms are, or are considered as if they were, parts of a rigid structure are
specified by the use of the stereodescriptors cis and trans
Note: The Greek letters 
and 
in cases where these atoms are, or are considered as if they were, parts of a rigid structure are specified by the use of the stereodescriptors cis
and trans
or E and Z. are also used as stereodescriptors in specific classes of compounds, such as
steroids.
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Isomers
Convention
This HTML reproduction is as close as possible to the published version [see IUPAC, Commission on Nomenclature of Organic Chemistry. A Guide to IUPAC Nomenclature of Organic Compounds
(Recommendations 1993), 1993, Blackwell Scientific publications, Copyright 1993 IUPAC]. If you need to cite these rules please quote this reference as their source.
Published with permission of the IUPAC by Advanced Chemistry Development, Inc., www.acdlabs.com, +1(416)368-3435 tel, +1(416)368-5596 fax. For comments or suggestions please contact [email protected]