CC(C)(C)C1=Nc2c(Br)cc(C(C)(C)C)cc2C(C(F)(F)F)(C(F)(F)F)O1
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?