C=C1C(C)C2C(Cc3ccccc3)NC(=O)C23C(OC(C)=O)/C=C/C(C)(O)C(=O)C(C)C/C=C/C3C1O
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?