CCCn1c2c(c(O)c(C(=O)Nc3ccc(OC)cc3)c1=O)CCCC2
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?