CC1OC(c2ccc3c(c2O)C(=O)C2=C(C3=O)C3(O)C(=O)CC(C)(O)CC3(O)C=C2)CC(O)C1O
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?