CN(C)c1cc[n+](CCC(=O)Nc2cccc([N+](=O)[O-])c2N)cc1.[Cl-]
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?