COC(=O)[C@H]1C[C@H]2[C@@H]3CC[C@H]4C[C@@H](OC)CC[C@]4(C)[C@H]3CC[C@]2(C)[C@@]2(CCCO2)O1
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?