COC(=O)[C@@H]1c2[nH]c3ccccc3c2C[C@@H]2c3ccccc3NC(=O)[C@@H]21
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?