COc1cc(Cn2c3c(c4c(C(=O)NCCN(C)C)c(O)ccc42)C(=O)c2ccccc2C3=O)cc(OC)c1
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?