O=C(O)c1cc(O)c2c(c1)C([C@@H]1c3cccc(O)c3C(=O)c3c(O)cc(C(=O)O)cc31)c1cccc(O)c1C2=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?