Cc1ccc(-c2nn3c(C)nnc3s2)cc1NC(=O)COc1ccc(Br)cc1
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?