COc1cccc(N2CCN(C(=O)CN(c3cc(C)cc(C)c3)S(=O)(=O)c3c(C)noc3C)CC2)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?