COC(=O)C(CC(C)C)NC(=O)C(Cc1ccccc1)NC(=O)C1CCCN1C(=O)C(CO)NC(=O)c1ccc(-c2ccc(Cl)cc2Cl)o1
A lower number of negative pKa indicates that the acid dissociates more entirely in water. What is the negative pKa of this molecule?