COc1ccc2[nH]c3c(c2c1)[C@H](C)C[C@@H]1C(=O)N(c2ccccc2)C(=O)[C@H]31
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?