CCOc1ccccc1Nc1sc(C(=O)c2ccccc2)c(N)c1C(=O)NCCc1ccccc1
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?