O=C1CSC2(CC(/C=C/C=C/c3ccccc3)=NN2c2cccc(S(=O)(=O)O)c2)N1c1nc2ccccc2s1
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?