Cc1ccc2nsnc2c1S(=O)(=O)N(Cc1cc2cccc(C)c2nc1O)CC1CCCO1
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?