CC(=O)OCC1OC(N2C(=O)[C@@H](Oc3ccccc3)[C@H]2/C=C/c2ccccc2)C(OC(C)=O)C(OC(C)=O)C1OC(C)=O
A rotatable bond is defined as any single non-ring bond, attached to a non-terminal, non-hydrogen atom. How many bonds in the molecule are rotatable?