CCC(C)C1=C(O)[N+]2([O-])Oc3ccc(-c4c(O)c(O)c(-c5ccc(OC(C)=O)cc5)c(OC(C)=O)c4OC(C)=O)cc3OC2(C(C)CC)C(=O)N1O
The negative base-10 logarithmic of dissociation constant (pka) for an acid is a direct consequence of the underlying thermodynamics of the dissociation reaction; the pKa value is directly proportional to the standard Gibbs free energy change for the reaction. What is the pka value of this molecule?