CC1(O)CC23CC(O)C4(O)C(CC(O)C4(C)C)C(C)(O)C2CCC1C3O
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?