CCN(CC)S(=O)(=O)c1ccc(C(=O)NCCSc2c(-c3ccc(C)cc3)[nH]c3ccccc23)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?