CC(=O)NC1C(OCc2ccccc2)OC(CO)C(O)C1OCC(=O)N[C@@H](C)C(=O)N[C@H](CCC(=O)NCCCCNc1c2ccccc2nc2cccc([N+](=O)[O-])c12)C(N)=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?