COC(=O)C12OCC34C(CC5C(C)C6=CC(=O)OC6=CC5(C)C3C(O)C1O)OC(=O)C(OC(C)=O)C24
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?