COc1ccc(OC)c(C(=O)c2c(N)c(-c3nc(-c4ccc(C)c(C)c4)cs3)c3ccccn23)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?