COC(=O)c1scc(-c2ccc(C)cc2)c1S(=O)(=O)Nc1c(C)cc(C)cc1C
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?