N#C/C(=C\c1ccc(Br)cc1)c1nc(-c2cc3cc(Br)ccc3oc2=O)cs1
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?