O=C(c1ccco1)N(Cc1cccnc1)C(c1ccccc1)c1nc2ccccc2[nH]1
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?