Cc1ccnc(N/C=C(/NC(=O)c2ccccc2)C(=O)N/N=C\c2ccc(Cl)cc2)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?