Brc1ccc(C2CC3(c4ccccc4)ON=C(c4ccccc4)N3c3ccccc3S2)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?