Cc1cc(C)cc(C(=O)Oc2coc(CSc3nnc(NC(=O)C4CC4)s3)cc2=O)c1
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?