COc1ccc(C2=NN(C(C)=O)C(c3cn(-c4ccccc4)nc3-c3cccs3)C2)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?