O=C(Oc1ccc2c(-c3ccccc3)c(C(=O)Nc3ccc(Cl)cc3)c(=O)oc2c1)c1ccccc1
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?