Showing Stereochemistry

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When the Show Stereochemistry option is selected, ChemDraw calculates the absolute stereochemistry for tetrahedral atoms and double bonds according to the Cahn-Ingold-Prelog (CIP) priority rules. For more information about the CIP rules, see "Stereochemistry".

Only tetrahedral and double-bond stereochemistry are supported, and only non-racemic stereochemistry is interpreted. Stereochemical indicators for aromatic bonds are not shown.

ChemDraw calculates and displays the following stereochemical terms:

• (R), (S)-Standard tetrahedral stereochemistry
• (r), (s)-Tetrahedral stereochemistry determined by other stereochemical centers. For example: cis-decalin and myo-inositol.
• (E), (Z)-Standard double-bond stereochemistry

The atom label settings determine the font style and size of the terms.