COc1ccc(Nc2nc(Nc3ccc(OC)cc3OC)nc(N3CCN(C)CC3)n2)c(OC)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?