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Phenylbutazone
C19H20N2O2 308.37
 3,5-Pyrazolidinedione, 4-butyl-1,2-diphenyl-.
 4-Butyl-1,2-diphenyl-3,5-pyrazolidinedione [50-33-9]

» Phenylbutazone contains not less than 98.0 percent and not more than 102.0 percent of C19H20N2O2, calculated on the dried basis.

USP REFERENCE STANDARDS FOR PURCHASE

USP Phenylbutazone RS
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