O=C(O)C(F)(F)F.O=C1C(Cc2ccccc2)Nc2ncnc(N3CCN(c4ccccc4)CC3)c2N1Cc1ccccc1
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?