COC(=O)C1=C(C(=O)OC)C2(C(=O)OC)OC1(OC)C(C1(C(=O)OC)C(C(=O)OC)=C1C(=O)OC)=C2C(=O)OC
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?