COc1ccccc1C(c1c(O)cc(C)n(Cc2ccco2)c1=O)N1CCCCC1
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?