C[C@@H](CO)N1C[C@@H](C)[C@@H](CN(C)CC2CC2)Oc2c(NC(=O)c3nc4ccccc4s3)cccc2C1=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?