O=C(Nc1ccc(Cl)c(-c2nc3cc(Cl)ccc3o2)c1)c1cc([N+](=O)[O-])ccc1N1CCOCC1
A rotatable bond is defined as any single non-ring bond, attached to a non-terminal, non-hydrogen atom. Amide C-N bonds are not counted because of their high barrier to rotation.  How many rotatable bonds does the molecule have?