Ibuprofen EP Impurity A

2-(3-isobutylphenyl)propanoic acid; (2RS)-2-[3-(2-methylpropyl)phenyl] propanoic acid; α-Methyl-3-(2-methylpropyl)benzeneacetic Acid; α-(3-Isobutylphenyl)propionic Acid; 2-[3-(2-Methylpropyl)phenyl]propanoic Acid;α-Methyl-3-(2-methylpropyl)phenylacetic Acid; meta-Ibuprofen;