answer:“Ibuprofen from isobutylphenylpropanoic acid) is a nonsteroidal anti-inflammatory drug (NSAID) used for relieving pain, helping with fever, and reducing inflammation… Ibuprofen was derived from propanoic acid…and patented in 1961. Originally marketed as Brufen, ibuprofen is available under a variety of popular trademarks, including Motrin, Nurofen, Advil, Nuprin and many others. Generic formulations are available as well.” Source There is no reason not to buy the generic.