COCc1ccc(CN2CCCC(C(=O)Nc3ccccc3-c3ccc(OC)cc3)C2)o1
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?