Cc1cc(C)nc(N2CCCC(C(=O)Nc3nnc(C(C)C)s3)C2)n1
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?