O=C(O[C@@H]1[C@@H]2O[C@]2(CO)[C@H]2[C@H](OC3OC(CO)C(O)C(O)C3O)OC=C[C@@H]12)c1ccc(O)c(O)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?