C[C@@H]1O[C@@H]2C3=C(C(=O)[C@H]4O[C@@H]4[C@H]3O)C1[C@@H]1[C@@H](C)OC=C3[C@H](O)[C@H]4O[C@@H]4/C(=N\OCc4ccccc4)[C@@]321
A lower number of pka indicates that the acid dissociates more entirely in water. What is pka of the molecule?