COC(=O)C1OC(=O)C2OC23[C@@]1(C)CCC1[C@@]3(C)C(OC(C)=O)CC2C(C)(C)C(=O)CC[C@@]21C
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?