COc1cc(C2C(C(=O)Nc3ccccc3C)=C(C)Nc3nc(SCc4cc(C)ccc4C)nn32)ccc1O
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?