CC(C)N1CCC2(CC1)N=C(c1ccc3c(c1)OCO3)CC(c1cc(Cl)ccc1O)N2
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?