COc1ccc(C2c3c(n(Cc4ccccc4)cnc3=N)Oc3ccc4ccccc4c32)cc1OC
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?