Cc1ccc(NC(=O)Cn2ncc3c4ccccc4n(Cc4ccccc4)c3c2=O)cc1Cl
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?