5-Methylindole, also known as skatole, is a chemical compound with the molecular formula C9H9N. It is a derivative of indole and can be found in various natural sources including animal feces, flowers, and coal tar. 5-Methylindole has a distinct, unpleasant odor and is often used in the production of fragrances and pharmaceuticals. Additionally, it has been studied for its potential biological activities and industrial applications.