COc1ccc(Cn2c(=O)c3oc4ccccc4c3n(CC(=O)Nc3cc(C)cc(C)c3)c2=O)cc1
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?