CCOc1ccc(C(=O)c2cn(CC(=O)Nc3ccc4c(c3)OCCO4)c3ccc(OC)cc3c2=O)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?