Ibuprofen belongs to the arylpropionic-acid class of NSAIDs and is chemically 2-(4-isobutylphenyl)propionic acid. This skeleton corresponds to a substituted phenyl-α-methylacetic acid derivative. By comparison, indomethacin is an indole-acetic-acid derivative, while drugs such as mefenamic acid belong to the N-arylanthranilic-acid class.
