CCn1c(CC(=O)Nc2ccc(C)c(Cl)c2)nnc1SCCOc1ccc(OC)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?