O=C(c1cccc(Br)c1)N1CCN(c2cnn(-c3ccccc3)c(=O)c2Cl)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?