CCN1CCN(CCCC(=O)Nc2n[nH]c3nnc(-c4cccc(F)c4F)cc23)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?