Cc1cc(C)c2nc3c(c([C@H](O)[C@@H]4CCCCN4)c2c1)CC/C3=C/c1ccc(Cl)cc1
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?