Within the VRC-TST approach, the radicals are assumed to rotate about arbitrarily located "pivot points". The reaction coordinate is then defined in terms of a fixed separation between these pivot points. The full variational optimization then is carried out for both the pivot point location and the separation between them. These optimizations are usually accomplished through grid-based evaluations of the numbers of available states, N (E,J) . In some instances, it is effective to include multiple pivot points on each radical, which leads to a multifaceted transition-state dividing surface. In this work, we employed the VRC-TST approach with direct evaluations of the interaction energies (using multireference electronic structure theory as described in the following subsection). The pivot points were placed either directly at the location of the radical site on each fragment, or on both faces of the reacting fragment at distances ranging from 0.26 to 0.79 Å from the radical site and along the appropriately defined axis. As many as 48 dividing surfaces were constructed for each reaction by considering point-to-point separation distances ranging from 2.1 to 10.6 Å. Monte Carlo orientational sampling was terminated upon achieving integration uncertainties below a 3% threshold, sometimes requiring as many as 4000-5000 samplings and single-point energy evaluations for each face of a given dividing surface.