COc1cc(-c2cc(OC)c3c(C)oc(C)c3c(=O)c2)ccc1OC(=O)c1ccccc1Cl
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?