O=C(COC(=O)c1ccc(S(=O)(=O)NCc2ccco2)cc1)Nc1ccc(Cl)cn1
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?