Cc1nc2sc(C(=O)Nc3ccc(F)cc3)c(N)c2c(-c2ccc(Br)cc2)c1C(=O)Nc1ccc(Cl)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?