CCN(CC)CCN1C(=O)c2c(c3c4cccc(Cl)c4n(C4OC(CO)C(OC)C(O)C4O)c3c3[nH]c4c(Cl)cccc4c23)C1=O
An acid's negative base-10 logarithmic dissociation constant (pka) follows directly from its underlying thermodynamics; pKa is directly proportional to its standard Gibbs free energy change. What is the pka value of this molecule?