O.O=c1c2sc3nc(N4CCOCC4)c4c(c3c2nnn1Cc1ccccc1)CCCC4
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?