COc1ccc2[nH]c3c(c2c1)CCN1C(=O)C(CC(=O)NCc2ccco2)C[C@H](C(=O)N2CCOCC2)[C@@]31CCC1CCCC1
A lower number of negative pKa indicates that the acid dissociates more entirely in water. What is the negative pKa of this molecule?