O=C(CSc1n[nH]c2c3cc(S(=O)(=O)N4CCOCC4)ccc3nc-2n1)Nc1ccccc1Cl
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?