COc1ccc(OC)c(C2C(C(=O)Nc3ccc(C)cc3C)=C(C)Nc3c(C(=O)Nc4ccc(F)cc4)cnn32)c1
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?