CC(C)=CCc1cc2c(cc1O)OC[C@H]1c3cc4c(cc3O[C@@H]21)OCO4
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?