CS(=O)(=O)O.Cc1cnc(NCCCN(C)C)c2c1[nH]c1ccc3cc(O)ccc3c12
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?