Experimental studies have demonstrated the importance of non-thermal bimolecular association chemistry. Recently a fully reversible method for incorporating any number of such non-thermal reactions into a single master equation has been developed (Green and Robertson, 2014) [10]. Using this methodology experimental results for the system: (1) (CHO)(2) + OH -> HC(O)C(O) + H2O, (2) HC(O)C(O) -> HCO + CO, (3) HC(O)C(O) + O2 -> OH + CO + CO2, are modeled, reproducing the temperature and pressure dependence of the OH yield. An issue remains as to how to model energy partition into HC(O)C(O). (C) 2016 Elsevier B.V. All rights reserved.