Synonyms: Ibuprofen Imp. B (EP),(2RS)-2-(4-Butylphenyl)propanoic acid, Benzeneacetic acid, 4-butyl-α-methyl-, Hydratropic acid, p-butyl- (7CI,8CI), 4-Butyl-α-methylbenzeneacetic acid, 2-(4-Butylphenyl)propanoic acid, 2-(4-n-Butylphenyl)propionic acid, 2-(p-Butylphenyl)propionic acid, p-Butylhydratropic acid, p-Butyl Ibuprofen