Cc1ccc2c(c1)NC(=O)C(CC(=O)Nc1ccc(CN3CCC(C)CC3)cc1)O2
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?