COc1ccc(C2C(Oc3ccccc3)C(=O)N2c2ccc(C)c(C)c2)cc1OC
An acid's negative base-10 logarithmic dissociation constant (pka) follows directly from its underlying thermodynamics; pKa is directly proportional to its standard Gibbs free energy change. What is the pka value of this molecule?