C[C@@H]1O[C@H](O[C@@H]2[C@@H](Oc3cc(O)c4c(c3)O[C@H](c3ccc(O)cc3)CC4=O)O[C@@H](CO)[C@@H](O)[C@H]2O)[C@@H](O)[C@H](O)[C@@H]1O.O
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?