COc1ccc(/C=C2/CC/C(=C\c3ccc(OC)c(OC)c3OC)C2=O)c(OC)c1OC
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?