O=C(N/N=C/c1c[nH]c2ccccc12)c1[nH]c2ccc(Cl)cc2c1-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?