CC(=O)c1c(O)cc(O)c(-c2c(C)cc(O)c3c2C(=O)c2cccc(O)c2C3=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?