COc1c(O)c2c3c(c(C)cc(O)c3c1O)C(=O)C(O)(C(C)(C)C(C)=O)C2=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?