Cc1cc(N)n(-c2ccc(Oc3ccccc3)c(S(=O)(=O)O)c2)n1
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?