COc1ccc(C(=O)NC2(C(F)(F)F)NC(=O)N(CCCc3ccccc3)C2=O)c(OC)c1OC
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?