CC1(C)OC2CC(=O)OC[C@@]23C1CC(=O)[C@]1(C)C3CC[C@@]2(C)C(c3ccoc3)OC(=O)C3O[C@@]321
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?