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Enantioselective Syntheses
 In an enantioselective reaction, a chiral
 reagent, catalyst, or solvent must assert
 an influence on the course of the
 reaction.
Enzymes:

 Enzymes possess an active site where the
 reactant molecules are bound.
 This active site is chiral, and only one
 enantiomer of a chiral reactant fits it properly
 and is able to undergo reaction.

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