COc1cccc(C2c3c(ncn(-c4cccc(C#N)c4)c3=N)Oc3ccc4ccccc4c32)c1
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?