COc1cc([C@@H]2Oc3cc4oc(-c5ccccc5)cc(=O)c4c(O)c3O[C@H]2OC)ccc1O
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?