Cc1csc(-c2coc3cc(O[C@@H]4O[C@H](CO)[C@@H](O)[C@@H](O)[C@H]4O)ccc3c2=O)n1
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?