COc1ccc2[nH]cc(CCNC(=O)[C@H](Cc3ccccc3)NC(=O)[C@@H](NCC(F)(F)F)C(C)C)c2c1
An acid's negative base-10 logarithmic dissociation constant (pka) follows directly from its underlying thermodynamics; pKa is directly proportional to its standard Gibbs free energy change. What is the pka value of this molecule?