S

Fig. 2.6 Chemical structures of the enantiomers of R — a-alanine (left) and S — a-alanine (right), depicted with CIP-rules for labelling of the R and the S-configuration in a clockwise manner, the stereogenic centre shows R-configuration (R for rectus), while an anticlockwise rotation will result in S-configuration (S for sinister). In the case of Figs. 2.1 and 2.6, the chemical structures given on the right depict the amino acid a-alanine in its S-configuration; the structures on the left show R-a-alanine. Following the same guidelines, the Cahn-Ingold-Prelog nomenclature can be applied for molecules with more than one stereogenic center as well.

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