COc1cc(C(c2nnnn2C2CCCC2)N2CCc3ccccc3C2)ccc1O.Cl
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?