CC(=O)Nc1sc2c(c1C(c1ccccc1Cl)N1CCN(CCO)CC1)CCCC2
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?