COC(=O)C1=C(CS(=O)(=O)c2cc(Cl)ccc2OC)NC(=O)NC1c1ccc(O)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?