COc1ccc2c3c1O[C@H]1C4(OC)C=CC5(C6C(=O)NNC(=O)C64)C(C2)N(C)CCC315
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?