COc1cc(NC(=O)CN(c2cc(C)cc(C)c2)S(=O)(=O)c2c(C)noc2C)cc(OC)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?