COc1ccc(CCNC(=O)CCCn2c(=O)c3ccccc3n(CC(=O)Nc3ccc(C)cc3Cl)c2=O)cc1OC
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?