CC(C)(C)C(=O)N1CCN(c2ccc([N+](=O)[O-])c(-n3nc(-c4ccccc4)c4ccccc4c3=O)c2)CC1
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?