COC(=O)C1=CN(c2cccc(C)c2)C=C(C(=O)OC)C1c1cc(OC)c(O)c([N+](=O)[O-])c1
An acid's negative base-10 logarithmic dissociation constant (pka) follows directly from its underlying thermodynamics; pKa is directly proportional to its standard Gibbs free energy change. What is the pka value of this molecule?