COc1ccc(OC)c(C(=O)NC(CC(N)=O)c2ccc(N3CCC(N4CCCC4)CC3)c([N+](=O)[O-])c2)c1
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?