Cc1ccc(C(=O)NCC(=O)NCCc2ccc(S(N)(=O)=O)cc2)s1
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?