COc1ccc(/C(O)=C/c2nc3ccc(C(=O)NCCc4cccc(C)c4)cc3nc2O)cc1OC
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?