Cc1ccc(-c2[nH]c3ccccc3c2SCCNC(=O)c2ccc(S(=O)(=O)N(C)C)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?