COc1ccc(CCNC(=O)c2c(C)nn(-c3ccc(F)cc3)c2-n2cccc2)cc1OC
An acid's negative base-10 logarithmic dissociation constant (pKa) follows directly from its underlying thermodynamics; the negative pKa is directly proportional to its standard Gibbs free energy change. What is the negative pKa value of this molecule?