CCCCCNC(=O)[C@H](Cc1ccc(N(C(=O)C(=O)O)c2ccccc2C(=O)O)c(/C=C/C(N)=O)c1)NC(=O)[C@H](Cc1ccccc1)NC(=O)CCC(=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 pKa value is directly proportional to the standard Gibbs free energy change for the reaction. What is the pka value of this molecule?