COC(=O)C(Cc1ccc([N+](=O)[O-])cc1)NC(=O)C(CC(=O)OC(C)(C)C)NC(=O)OC(C)(C)C
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?