O=C1C2=C(C(=O)c3ccccc31)[C@H]1O[C@](CCCCN3C(=O)c4ccccc4C3=O)(Cc3ccccc31)O2
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?