Cc1cccc(NC(=O)C2CCC(CNS(=O)(=O)c3csc(C(N)=O)c3)CC2)c1C
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?