CCN1CCN(Cc2ccc(NC(=O)c3cc(NC(=O)C4=NN(c5ccccc5)C(=O)C4)cc(OC)c3)cc2C(F)(F)F)CC1
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?