CC(=O)OCC12C(OC(C)=O)C[C@@H](C)C3(CC(c4ccoc4)OC3=O)C1CCC(O)C21CO1
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?