COc1ccc(C(=O)C(c2ccc(OC)cc2)C2(O)C(=O)Nc3c(Cl)cc(Cl)cc32)cc1
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?