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<p>agent. In nature, only one enantiomer of most chiral biological compounds, such as <a href="page.php?w=amino_acid">amino acid</a>s (except <a href="page.php?w=glycine">glycine</a>, which is achiral), is present. Enantiomers differ by the direction they rotate polarized light: the amount of a chiral compound's optical rotation in the (+) direction is equal to the amount of its enantiomer's rotation in the (-) direction. </p>

<p><big>Diastereomers</big></p>
<p><b>Diastereomers</b> are stereoisomers not related through a reflection operation. They are not</p><p>
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