Cc1cc2cc(CCNC(=O)c3c(-c4ccccc4Cl)noc3C)c(O)nc2cc1C
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?