novichok a-234 , organophosphate nerve agent, according to hoenig and ellison, c5h8cl2f2no3p molecule. structural chemical

234 a234 acetylcholinesterase agent atom atomic c5h8cl2f2no3p cage carbon carboxamidine chemical chemistry compound drawing ellison flat formula hoenig hydrogen icon illustration model molecular molecule nerve nitrogen notebook novichok organic organophosphate oxygen pesticide poison poisoning sheet structural structure toxic vector warfare weapon