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. 2018 Oct 19;23(10):2695. doi: 10.3390/molecules23102695

Figure 2.

Figure 2

Three ways to calculate the free energy difference between an MM state and a QM state: (a) calculating the free energy difference between an MM end state and QM with the Zwanzig equation; (b) generating a tailored force field (MM’) with better overlap with the QM target to calculate the free energy difference; (c) combining data from both MM, MM’ and QM.