O=C(NC12C[C@H]3C[C@@H](C1)C[C@@H](C2)C3)N1CCN(C2CCCCC2)CC1
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?