has role barbiturates antidepressant anxiolytic drug antipsychotic agent antineoplastic agent anticonvulsant sedative excitatory amino acid antagonist phenobarbital 5-ethyl-5-phenylpyrimidine-2,4,6(1H,3H,5H)-trione A member of the class of barbiturates, the structure of which is that of barbituric acid substituted at C-5 by ethyl and phenyl groups. CHEBI:8069 drug allergen