C[C@H]1COC(=O)[C@H](CC(=O)OC(C)(C)C)C/C=C\C[C@@H](CC(=O)N(CCO)Cc2ccccc2)C(=O)N1
A lower number of negative pKa indicates that the acid dissociates more entirely in water. What is the negative pKa of this molecule?