C[C@@H](CO)N1C[C@@H](C)[C@@H](CN(C)Cc2ccc(C(=O)O)cc2)Oc2cc(/C=C/c3ccccc3)ccc2S1(=O)=O
A lower number of negative pKa indicates that the acid dissociates more entirely in water. What is the negative pKa of this molecule?