O=[N+]([O-])c1ccc(/C=C/c2ccc(/C=C/c3ccc([N+](=O)[O-])cc3[N+](=O)[O-])cc2)c([N+](=O)[O-])c1
A negative log P value indicates preferential solubility in water and a positive value indicates an affinity for octanol. What is the negative log P of this molecule?