NS(=O)(=O)c1ccc(CCNc2ccn3nc(-c4ccc(OCCN5CCOCC5)cc4)cc3n2)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?