Cc1ccc(NC(=O)CCNS(=O)(=O)c2ccc3nc(O)oc3c2)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?