COc1ccc(-n2nc(C(=O)Nc3ccccc3OC)c3c4ccccc4n(C)c3c2=O)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?