C[C@@H]1ON(C)[C@H]2C[C@H]3c4cc(N5CCN(C)CC5)ccc4CCN3C(=O)[C@@H]12
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?