O=[N+]([O-])c1ccc2nc(/C(=N/Nc3ccccc3)C(O)c3ccc(C(O)/C(=N\Nc4ccccc4)c4nc5ccc([N+](=O)[O-])cc5nc4O)cc3)cnc2c1
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?