N#Cc1cc([N+](=O)[O-])ccc1NC(=O)/C(=N\NC(=O)c1ccncc1)C(c1cnc2ccc([N+](=O)[O-])cc2n1)[N+](=O)[O-]
A lower number of pka indicates that the acid dissociates more entirely in water. What is pka of the molecule?