O=C1C2=CC[C@H]3C(=O)N(Cc4ccccc4)C(=O)[C@@H]3[C@@H]2[C@H](O)[C@@H]2O[C@H]12
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?