O=[N+]([O-])c1ccc2c(/N=N/c3ccc4ccccc4c3O)c(O)cc(S(=O)(=O)[O-])c2c1.[Na+]
For non-ionizable compounds Log P = Log D throughout pH range, whereas for ionizable compounds LogD takes into account the partition of both ionized and non-ionized forms. What is the negative logD of this molecule?