COc1ccc(-c2nc(C(N)=O)c3nc(O)n(-c4ccccc4OC)c3n2)c(OC)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?