CCOC(=O)c1ccccc1OC(=O)c1ccc2c(c1)C1C=CCC1C(C(=O)O)N2
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?