Cc1c(Cl)cccc1NC(=O)C1CCCN(C(=O)c2cnn(-c3ccccc3)c2-n2cccc2)C1
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?