CC(C)(C)OC(=O)N[C@@H](Cc1ccccc1)C(=O)N1CCC(C(=O)N[C@@H](Cc2c[nH]c3ccccc23)C(=O)O)CC1
A lower number of negative pKa indicates that the acid dissociates more entirely in water. What is the negative pKa of this molecule?