USPUSP-NF
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Phenobarbital
C12H12N2O3 232.24
 2,4,6(1H,3H,5H)-Pyrimidinetrione, 5-ethyl-5-phenyl-.
 5-Ethyl-5-phenylbarbituric acid [50-06-6]

» Phenobarbital contains not less than 98.0 percent and not more than 101.0 percent of C12H12N2O3, calculated on the dried basis.

USP REFERENCE STANDARDS FOR PURCHASE

USP Phenobarbital RS
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