COC1/C=C\C=C(/C)C(=O)NC2=CC(=O)C(NCCCl)=C(CC(C)CC(OC)C(O)C(C)/C=C(/C)C1OC(N)=O)C2=O
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?