Cc1ccc(-c2c[n+](CC(=O)Nc3c(C)cccc3C)c3n2CCC3)cc1.[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?