NCC1O[C@@H](OC2C(N)C[C@H](N)[C@@H](O[C@H]3OC(CO)C(O)C(N)C3O)C2O)C(N)C(O)C1O
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?