CCn1cc(C(=O)NCc2ccco2)c(=O)c2cc(S(=O)(=O)N3CCC(C)CC3)ccc21
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?