CC(=O)c1cccc(S(=O)(=O)N2CCCC(c3nc(O)c4nnn(Cc5cccc(Cl)c5)c4n3)C2)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?