O=C1c2ccccc2C(=O)N1CCC[n+]1cc(-c2ccc(F)cc2)n2c1CCC2.[Br-]
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?