O=C1N[C@@H](Cc2cn(S(=O)(=O)c3ccc([N+](=O)[O-])cc3)c3ccccc23)C(=O)N[C@H]1Cc1ccccc1
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?