hydantoin
Pronunciation: hī-dan′tō-in
Definition: derived from urea or from allantoin; the NH–CH2–CO group is prototypical of α-amino acids. Hydantoin derivatives are formed by the reaction of phenylisothiocyanate or phenylisocyanate and a polypeptide.
Synonym(s): glycolylurea
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Examples: glitazone, GI cocktail, etc.

