CNC(=O)NC(=O)CSc1nc2cc(C(=O)OC)ccc2c(=O)n1-c1ccccc1
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?