CC[C@@]1(O)C(=O)OCc2c1cc1n(c2=O)Cc2c-1nc1ccccc1c2/C=N/c1ccccc1N[C@@H]1c2cc3c(cc2[C@@H](c2cc(OC)c(O)c(OC)c2)[C@H]2C(=O)OC[C@H]12)OCO3.Cl
A lower number of pka indicates that the acid dissociates more entirely in water. What is pka of the molecule?