Definition: A molecule containing the same number and kind of atom groupings as another but in a different arrangement in space; the stereoisomers are not interconvertible unless bonds are broken and reformed, by virtue of which the molecule exhibits different optic properties, as between d- and l-amino acids, or 5a- and 5ß-steroids.
[stereo- + G. isos, equal, + meros, part]
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Examples: glitazone, GI cocktail, etc.