CC(=O)C1(O)CCC2C3CCC4=C(Cl)C(=O)CCC4(C)C3CCC21C
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?