c1cc2c(cc1[C@H]1OC[C@@H]3[C@H]1CO[C@H]3c1ccc3c(c1)OCO3)OCO2
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?