O=C1OCCN1C(=O)[C@H]1[C@H](c2ccc(F)cc2)C(c2cccc(Cl)c2)=NN1c1ccc(Br)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?