Cc1ccc(-c2nc3scc(CCNS(=O)(=O)c4ccc(Oc5ccccc5)cc4)n3n2)cc1
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?