Ibuprofen EP Impurity - J

1-Oxo Ibuprofen; α-Methyl-4-(2-methyl-1-oxopropyl)benzeneacetic Acid; 2-(4-Isobutyrylphenyl)propionic Acid; Ibuprofen Impurity J (IP); (2RS)-2-[4-(2-Methylpropanoyl)phenyl]propanoic Acid; 2-(4-Isobutyrylphenyl)propanoic Acid; Ibuprofen Related Compound J (USP)