CC(=O)CCC[C@H](C)[C@@H](O)[C@@H]1O[C@H]([C@@]2(C)CCC(=O)O2)C[C@H]1C(=O)O
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?