Pronunciation: lak'tam, lak'tim
Definition: Contractions of “lactoneamine” and “lactoneimine,” and applied to the tautomeric forms –NH–CO– and –N=C(OH)–, respectively, observed in many purines, pyrimidines, and other substances; the latter form accounts for the acidic properties of uric acid.
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Examples: glitazone, GI cocktail, etc.