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ref: torsiondrive w/ MP2/6-311+G** → B3LYP-D3BJ/def2-TZVPD→ then optimize each frame with MP2/heavy-aug-cc-pVTZ → single point calculation with CCSD(T)/CBS (The CCSD(T)

energy with the aug-cc-pvdz basis set is extrapolated to the CBS limit using the MP2/aug-cc-pv[tq]z level of theory)

1. accuracy in optimized geometries

   1. method: (1) optimization of each frame in the reference torsion scan with varying combination of methods and basis sets. Then compare RMSD with the reference or (2) run entire torsiondrive for each combination

   2. effect of varying electronic structure theory (b3lyp/b3lyp-d3bj/ b3lyp-nl/ wb97x-v)

      1. from conformational energies benchmarking paper. (they were used with def2-qzvp)

      2. basis set: ?

   3. effect of varying basis sets: def2 family(def2 familyDZVP, def2-TZVP, def2-TZVPP, def2-TZVPD, def2-TZVPPD), 6-31+g**, 6-311+g**)

      1. functional: b3lyp-d3bj

2. accuracy in energy

   1. method: single point energy calculation at the reference frames and compare the deltadelta energy

   2. effect of varying electronic structure theory (b3lyp-d3bj/ b3lyp-nl/ wb97x-v)

      1. from conformational energies benchmarking paper. (they were used with def2-qzvp)

      2. basis set: def2-qzvp

   3. effect of varying basis sets: def2 family(def2 familyDZVP, def2-TZVP, def2-TZVPP, def2-TZVPD, def2-TZVPPD), 6-31+g**, 6-311+g**)

      1. functional: b3lyp-d3bj

• Psi4 performance benchmark for a single gradient calculation of FGG114 on i7-6850K 1 core

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