COc1ccc(N2C(=O)c3ccccc3NC2c2ccc(OC)c(COc3ccccn3)c2)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?