COc1cc2cc(C(=O)Nc3cc4n(n3)-c3ccccc3C4)[nH]c2c(OC)c1OC
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?