COc1ccc(S(=O)(=O)N2CCCC(C(=O)N3CCN(c4ccccc4)CC3)C2)cc1Cl
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?