Synonyms: Flurbiprofen Related Compound A (USP), 2-(Biphenyl-4-yl)propionic acid, Biprofen,(2RS)-2-(Biphenyl-4-yl)propanoic Acid, Flurbiprofen Imp. A (EP), [1,1′-Biphenyl]-4-acetic acid, α-methyl-, 4-Biphenylacetic acid, α-methyl- (8CI), Hydratropic acid, p-phenyl- (6CI,7CI), α-Methyl[1,1′-biphenyl]-4-acetic acid, (±)-2-(4-Biphenyl)propionic acid, 16300Y1, 2-((1,1′-Biphenyl]-4-yl)propanoic acid, 2-(4-Biphenyl)propionic acid, 2-(4-Biphenylyl)propanoic acid, 2-(4-Biphenylyl)propionic acid, 2-(4-Phenylphenyl)propionic acid, NSC 16300