O=C(O)C(F)(F)F.O=C1C(Cc2ccccc2)Nc2ncnc(N3CCCCC3)c2N1Cc1ccc(Br)cc1
The negative base-10 logarithmic of dissociation constant (pka) for an acid is a direct consequence of the underlying thermodynamics of the dissociation reaction; the pKa value is directly proportional to the standard Gibbs free energy change for the reaction. What is the pka value of this molecule?