CC(=O)Nc1ccc(NC(=O)C2CCCN(c3nnc(-n4cccc4)s3)C2)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?