COc1ccc(/C=C(/C(=O)N2CCCCC2C(=O)O)c2ccc(OC)c(OC)c2)cc1
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?