O=C1C2=C(C(c3ccccc3)=NCCN2)C(c2cccc([N+](=O)[O-])c2)N1c1ccccc1
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?