CC(ON=C1C2CCn3c(=O)n(-c4ccccc4)c(=O)n3C2C(O)C2OC12)c1cn(C2COCC2O)nn1
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?