[ use of spot analysis for the detection of 5-phenyl-5-ethyl-2- thiobarbituric acid ( thiophenobarbital ) and 5-phenyl-5-ethylbarbituric acid ( phenobarbital ) in addition to 5-phenyl-5-ethylhexahydropyrimidine-4,6-dione ( primidone ) ] .
C0031412
phenobarbital
C0033148
primidone