Cc1oc(-c2ccc(C(=O)NCCC(C)C)cc2)nc1CS(=O)(=O)c1ccccc1
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?