O=C(O)CCC(=O)Nc1ccc2c(c1)Cc1cc(NC(=O)CCC(=O)O)ccc1-2
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?