CCCCc1cc(=O)oc2cc(OCC(=O)NC(Cc3c[nH]c4ccc(O)cc34)C(=O)O)ccc12
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?