Cc1ccc(OCC(=O)Nc2ccc3nc(SCC(=O)N(C)c4ccccc4)sc3c2)cc1
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?