COc1ccc(OC)c(C2C(C(N)=O)=C(C)Nc3nc(-c4cccc(Cl)c4)nn32)c1
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?