CCCCCn1cc[n+](-c2nc3ccccc3nc2[N-]S(=O)(=O)c2ccccc2)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?