Cc1nc(NC(=O)c2cc3c(C)nn(-c4ccccc4)c3s2)sc1C(=O)Nc1ccccc1
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?