Oc1ccc(Br)cc1/C=N/c1ccc(/N=C/c2cc(Br)ccc2O)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?