O=S(=O)(O)c1ccccc1/N=N\c1ccc(/N=N/c2c(O)ccc3ccccc23)c(S(=O)(=O)O)c1
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?