CC(CC(C)C(=O)N1CCOCCN(C(=O)C(C)CC(C)C(=O)O)CCOCC1)C(=O)O
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?