novichok a-234 molecule 3d, molecular structure, ball and stick model, structural chemical formula nerve agent

novichok a234 nerve agent mirzayanov molecule molecular structure chemical formula model c8h18fn2o2p atom oxygen carbon hydrogen chemistry organophosphate weapon structural poisoning warfare poison acetylcholinesterase atomic toxic ellison hoenig carboxamidine organic binary composition cage skripal science skeletal a-234 ball stick agent