For a better understanding of the chemistry involved during the combustion of components of diesel fuel, the structure of a laminar lean premixed methane flame doped with n-propylcyclohexane has been investigated. The inlet gases contained 7.1% (molar) methane, 36.8% oxygen, and 0.81% n-propylcyclohexane (C9H18), corresponding to an equivalence ratio of 0.68 and a C9H18/CH4 ratio of 11.4%. The flame has been stabilized on a burner at a pressure of 6.7 kPa (50 Tort) using argon as diluent, with a gas velocity at the burner of 49.2 cm/s at 333 K. Quantified species included the usual methane C-0-C-2 combustion products, but also 17 C-3-C-5 hydrocarbons, seven C-1-C-3 oxygenated compounds, and only four Cyclic C6+ compounds, namely benzene, 1,3-cyclohexadiene, cyclohexene, and methylenecyclohexane. A new mechanism for the oxidation of n-propylcyclohexane has been proposed. It allows the proper simulation of profiles of most of the products measured in flames, as well as the satisfactory reproduction of experimental results obtained in a jet-stirred reactor. The main reaction pathways of consumption of n-propylcyclohexane have been derived from rate-of-production analysis. (C) 2009 The Combustion Institute. Published by Elsevier Inc. All rights reserved.