[N-]=[N+]=NC[C@H]1OCO[C@H](CN=[N+]=[N-])[C@@H](OCCOCCCl)[C@@H]1OCCOCCCl
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?