O=C(CCC(=O)N(CC(=O)NC1CCCCC1)Cc1ccco1)Nc1nccs1
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?