CC(=O)O.COc1cc(C)cc2c(-c3c(O)cc(O)c4c3C[C@H](C)N[C@H]4C)cc(-c3cc(-c4c(O)cc(O)c5c4C[C@H](C)N[C@H]5C)c4cc(C)cc(OC)c4c3O)c(O)c12
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?