COc1ccc(S(=O)(=O)N(CC(=O)NN=C2CCN(C)CC2)c2ccc(C)cc2)cc1OC
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?