Cc1ccc(S(=O)(=O)c2cn(CC(=O)Nc3ccccc3)c3cc4c(cc3c2=O)OCO4)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?