[Cl-].c1ccc(-[n+]2nc(Nc3cccc4ccccc34)sc2-c2c3ccccc3cc3ccccc23)cc1
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?