O=C(Nc1ccccc1)c1nn(-c2cc(S(=O)(=O)[O-])c([N+](=O)[O-])cc2Cl)[n+](-c2cc(S(=O)(=O)[O-])c([N+](=O)[O-])cc2Cl)n1.[Na+]
A rotatable bond is defined as any single non-ring bond, attached to a non-terminal, non-hydrogen atom. How many bonds in the molecule are rotatable?