CC1=C(C)C(=O)NC(Nc2nc(C)c3cc(C)cc(C)c3n2)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?