O=C1N(CN2CCOCC2)CN(CN2CCOCC2)C(=O)N1Cc1ccc(-c2ccc(CN3C(=O)N(CN4CCOCC4)CN(CN4CCOCC4)C3=O)cc2)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?