COC(=O)C1=C([C@H]2COC(C)(C)O2)[C@H]2C[C@@H]1[C@@H]1OC(C)(C)O[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?