COc1cccc(/C=C2/N=C(c3ccccc3)N(n3c(-c4ccccc4)nc4ccccc4c3=O)C2=O)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?