CC(=O)Nc1ccc(NC(=O)CSc2nnc3c4ccccc4n(C)c3n2)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?