O=C(C1=C(O)C(=O)N(C2CCS(=O)(=O)C2)C1c1cccc(O)c1)c1ccc(Cl)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?