COc1cc2nc(-c3c(F)cccc3F)n(Cc3c(F)cccc3F)c2cc1Cc1c(F)cccc1F
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?