O=C(NC12C3C4C5C1C2C(Br)(C43)C51OCCO1)NC12C3C4C5C1C2C(Br)(C43)C51OCCO1
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?