COC(=O)CN(C(S)=Nc1ccc(F)cc1)C1CC(=O)N(c2ccccc2)C1=O
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?