c1ccc2c3c(cc(N4CCOCC4)c2c1)OC1(N2CCOCC2)CCCCC1O3
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?