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Surprising adsorption dynamics in terms of an either direct or pseudodirect pathway in contrast to common precursor-mediated surface reactions is shown for the title system by theoretical investigations. We present a computational protocol for the description of the adsorption dynamics in this complex system that is transferable to other large molecules. The system size prohibits the use of established accurate methods, and approximations have to be made and validated. Our approach combines potential energy surface scans, reaction path determination methods, statistical thermodynamics, and ab initio molecular dynamics simulations based on density functional theory (DFT). This leads to a conclusive picture of adsorption dynamics in the limits of DFT accuracy and shows how a thoughtful selection of methods can comprehensively describe the adsorption dynamics of an experimentally relevant system that might seem too complex for ab initio approaches at first glance.