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Pronunciation: bī′yĕr[h]
Definition: that carbon bonds are set at fixed angles (109° 28′) and that those carbon rings are most stable that least distort those angles; for this reason, planar rings composed of 5 or 6 carbon atoms (cyclopentane, benzene) are more common than rings containing less than 5 or more than 6 carbon atoms.
Examples: glitazone, GI cocktail, etc.
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