Cc1ccc(Cl)cc1N1CCN(C(=O)Cc2ccc(-n3c(=O)[nH]c4ccsc4c3=O)cc2)CC1
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?