O=C(Cn1nnc(-c2ccc(CN3CCOCC3)cc2)n1)Nc1nc(-c2ccccc2)cs1
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?