N#C/C(=C/c1ccc(CNS(=O)(=O)c2ccccc2)o1)C(=O)NCc1ccccc1
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?