COc1ccc(C(C(=O)NCC2CCCO2)N(Cc2ccc(F)cc2)C(=O)CNC(=O)c2ccco2)cc1OC
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?