COCCCn1c(=O)/c(=C\c2ccccc2OC(C)C)s/c1=C(/C#N)C(=O)Nc1ccc(C(=O)O)cc1
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?