COc1ccc2c(c1)OC[C@@H]1c3cc(O)c(OCc4ccccc4)cc3O[C@H]21
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?