O=C(c1cc(C(=O)NCCc2ccccc2)c(=O)n(CCc2ccccc2)c1)c1cc(Cl)ccc1O
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?