COc1ccc(CCNC(=O)CN(c2cc(C)cc(C)c2)S(=O)(=O)c2c(C)noc2C)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?