2-Undecanone, also known as methyl nonyl ketone and IBI-246, is an organic compound with the formula CH3C(O)C9H19. It is a colorless oil. 2-Undecanone is usually produced synthetically, but it can also be extracted from various plant sources, including from essential oil of rue. It is found naturally in bananas, cloves, ginger, guava, strawberries, wild-grown tomatoes, and the perennial leaf vegetable Houttuynia cordata.