C[N@+]1([O-])[C@@H]2C[C@H](OC(=O)[C@@H](CO)c3ccccc3)C[C@@H]1[C@H]1O[C@H]12
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?