O=C(NCCNCC(O)COc1ccc(O)cc1)N1CCOCC1.O=C(NCCNCC(O)COc1ccc(O)cc1)N1CCOCC1.O=C(O)/C=C/C(=O)O
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?