O=[N+]([O-])c1ccc(S[C@H]2[C@H]3C[C@@H](Cl)[C@@H]2c2c(-c4ccccc4)[nH]c(-c4ccccc4)c23)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?