Stereochemistry Calculating Enantiomeric Excess from Optical Activity Check Also in Stereochemistry: Enantiomeric excess (ee) Stereoisomerism Chirality and Enantiomers The R and S system to label chiral centers Diastereomers Optical Activity Calculating Enantiomeric Excess from Optical Activity Symmetry and Chiralty. Meso Compunds Fischer projection