C/C=C(/C)C(=O)O[C@H]1[C@H]2[C@@H]([C@@H](OC(C)=O)[C@H](C)C(=O)[C@@]34C[C@@H](C)C(=O)[C@]3(/C=C(\C)[C@H]1OC(C)=O)O4)C2(C)C
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?