O=C1C([P+](c2ccccc2)(c2ccccc2)c2ccccc2)=C([O-])C(=Cc2ccc(Cl)c(Cl)c2)C([O-])=C1[P+](c1ccccc1)(c1ccccc1)c1ccccc1
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?