CC(=O)O.NC(CCC(=O)NC(CSC(=O)N(O)c1ccccc1)C(=O)NCC(=O)O)C(=O)O
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?