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D-, L- and DL-

 Prefixes to chemical names for compounds that have a centre of asymmetry in the molecule, and which can therefore have two forms.

  Most naturally occurring sugars have the d-conformation; apart from a few microbial proteins and some invertebrate peptides, all the naturally occurring amino acids have the lconfiguration. Chemical synthesis yields a mixture of the d- and l-isomers (the racemic mixture), generally shown as dl-.