Mesitylene, also known as 1,3,5-trimethylbenzene, is an aromatic hydrocarbon that contains a benzene ring with three methyl substituents attached at the 1, 3, and 5 positions. Chemically, its structure is represented as C9H12 and its molecular formula is C6H3(CH3)3. http://visualvistaventures.weebly.com/digital-endowments/mesitylene-an-important-industrial-aromatic-hydrocarbon