CC(=O)C[C@H](O)CC(=O)[C@H]1OC(=O)CCCCC/C=C/Cc2ccccc21
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?