CCCCC(=O)Nc1ccc2cc(C(=O)OC)c(ON3C(=O)c4ccccc4C3=O)nc2n1
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?