COc1cc(C2CC3=Nc4ncnn4C(c4cccs4)C3=C(O)C2)cc(OC)c1OC
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?