CCC1=C(OC(=O)N(CC)CC)N2C(=O)O/C(=N\CC(=O)OC)[C@]2(Cc2ccccc2)[C@H]2C1=CC[C@H]1C(=O)NC(=O)[C@H]12
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?