Cc1ccc(NC(=S)N(Cc2cccs2)Cc2cc3cccc(C)c3nc2O)cc1
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?