Cc1oc(-c2ccccc2Cl)nc1C[S+]([O-])CC(=O)NCCCN1CC(C)CC(C)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?