Cn1c(CCN2CCN(c3ccccn3)CC2)nc2cc(NS(=O)(=O)c3ccc(Cl)cc3)ccc21
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?