CC[C@@]1(O)C[C@H](OC2CC(N(C)C)C(O)C(C)O2)c2c(O)c3c(c(O)c2[C@H]1OC1CC(N(C)C)C(O)C(C)O1)C(=O)c1cccc(O)c1C3=O
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?