COc1ccc2c(c1OC)C(=O)O[C@H]2[C@@H]1c2cc3c(cc2CCN1C)OCO3
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?