O=c1[nH]c2c(cnn2-c2ccc(Cl)cc2)c(=O)n1-c1cccc(Cl)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?