COc1cc(N(CCC#N)CCC#N)ccc1C(=N/NC(=O)c1cc(Br)ccc1O)/N=N/c1ccc(C)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?