The fitting of these adjustable parameters to the input data represents the final step. When all parameters were simultaneously included, serious difficulties were found in the process, which resulted unsuccessful. Thus we applied the divide and conquer strategy, where the total fitting process is divided in four iterative steps. We begin by describing important properties along the process (geometries, vibrational frequencies and enthalpies), of reactants and products as the first step, saddle points as the second step and intermediate complexes as the third step. Finally, the R1 and R2 minimum energy paths were fitted to the corresponding input data. This four-step process is iteratively repeated until reasonable convergence with the input data is achieved. It is timeconsuming, slow and tedious because the strategy is not automatic and, in addition, the title reaction has two particular difficulties: the very flat entrance channels (with very small first energy derivatives), and the presence of two paths. When the fitting process is finished, we obtain the final set of 83 parameters describing both paths. The new surface is named PES-2024, which is an analytical full-dimensional representation of the title reaction.