COc1ccc(C(=O)Oc2ccc(C(c3c(C)n[nH]c3O)c3c(C)n[nH]c3O)cc2OC)cc1
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?