O=C(O[C@@H](/C=C/c1ccccc1)P1(=O)N(Cc2ccccc2)[C@@H]2CCCC[C@H]2N1Cc1ccccc1)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?