compound 12d greater affinity and higher reactivation efficiency(kr2=83 mm-1.min-1) than 2-PAM and HI-6.Compound 12d seven times more efficient in the reactivation of sarin-inhibited AChE compared with 2-PAM,and six times more efficient than HI-6. Compound12d completely inefficient in reactivating tabun-inhibited hAChE