CCOC(=O)C1=C(NC(=O)/C=C/c2ccc(OC)cc2OC)Nc2ccccc2N=C1C
An acid's negative base-10 logarithmic dissociation constant (pKa) follows directly from its underlying thermodynamics; the negative pKa is directly proportional to its standard Gibbs free energy change. What is the negative pKa value of this molecule?