C=C1C(=O)O[C@@H]2C[C@@H](C)[C@@H]3[C@@H](OC4OC(COC(C)=O)C(O)C(O)C4O)CC(=O)[C@@]3(C)C[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?