COC(=O)C1=CC2C=CC(C1C(=O)OC)C1C(C(=O)OC)=C(C(=O)OC)C(C(=O)OC)=C(C(=O)OC)C21OC
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?