COC(=O)c1cccc(N(C(=O)CNC(=O)c2ccco2)C(C(=O)NC2CCCC2)c2ccco2)c1
An acid's negative base-10 logarithmic dissociation constant (pKa) follows directly from its underlying thermodynamics; the negative pKa is directly proportional to its standard Gibbs free energy change. What is the negative pKa value of this molecule?