O=C(NCCCN(CCCCN(CCCNC(=O)C(F)(F)F)Cc1ccc2ccccc2c1)Cc1ccc2ccccc2c1)C(F)(F)F
A rotatable bond is defined as any single non-ring bond, attached to a non-terminal, non-hydrogen atom. How many bonds in the molecule are rotatable?