[O-][S@@+]1c2ccc3ccccc3c2N[C@H]2[C@@H]3C=C[C@@H](C3)[C@H]21
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?