Cc1cc(OCC(=O)Nc2nccs2)c2c(C)c(C)c(=O)oc2c1
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?