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The cymenes (methylcumenes, isopropyltoluenes) constitute a group of substances of aromatic hydrocarbons, which structure consists of a benzene ring with an isopropyl group (−CH(CH3)2), and a methyl group (−CH3) as a substituent. Through their different arrangement, they form three structural isomers with the molecular formula C10H14. They also belong to the group of C4-benzenes. The best-known isomer is the p-cymene, it occurs in nature and is one of the terpenes.

Name o-Cymene m-Cymene p-Cymene
Structural formula O-Cymol.svg M-Cymol.svg P-Cymol.svg
CAS number 527-84-4 535-77-3 99-87-6