S=C(Nc1ccccc1)Nc1ccccc1SC(/C=C/NNC1=NN=C(c2ccccc2)C(c2ccccc2)N1)c1ccccc1
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?