Cn1c2ccccc2c2cc(/C=C(\NC(=O)c3ccccc3)C(=O)NCC(=O)O)ccc21
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?