O=C(O)c1ccc2c(c1)C(=O)N(c1n[nH]c(-c3ccccc3)n1)C2=O
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?