CCCCN(CC)C(=O)c1c[nH]c2ccc(S(=O)(=O)N(C)c3ccc(Cl)cc3)cc2c1=O
An acid's negative base-10 logarithmic dissociation constant (pka) follows directly from its underlying thermodynamics; pKa is directly proportional to its standard Gibbs free energy change. What is the pka value of this molecule?