COc1ccc(C2c3c(-c4ccc(F)cc4)n[nH]c3C(=O)N2c2ccccc2)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?