O=C1c2ccccc2C(=O)[C@]23O[C@]12[C@@H](O)[C@H]1O[C@H]1C31Oc2cccc3cccc(c23)O1
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?