Based on these findings, the use of a CASPT2/cc-pVDZ potential along with the correction based on the average of the spin-splitting approaches, is taken to be the reference method in subsequent potential evaluations for the calculation of high-pressure-limit rate coefficients by VRC-TST. These conclusions are further validated in Figure and Figure . The small correction potential validates the high-level-corrected CASPT2/cc-pVDZ approach in yielding a high accuracy in the predicted rate coefficients.