Cc1cc(=O)[nH]c2cc(NC(=O)C(CCCNC(=N)N)NC(=O)OCc3ccccc3)ccc12.O=C(O)O
The negative base-10 logarithmic of dissociation constant (pKa) for an acid is a direct consequence of the underlying thermodynamics of the dissociation reaction; the negative pKa value is directly proportional to the standard Gibbs free energy change for the reaction. What is the negative pKa value of this molecule?