COc1ccc(C2=CC3=C(Br)C(=O)C(C)(OC(=O)c4cccs4)C(=O)C3=CO2)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?