CCCCN(C)C(=O)c1ccc(Nc2nc(C(N)CCc3ccccc3)cs2)nc1
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?