COc1ccc(C)cc1Nc1n[n+](-c2ccccc2)c(-c2ccc(OC)c(OC)c2OC)s1.[Cl-]
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?