In this letter, we describe the design and the synthesis of an organophosphorus hapten aimed at a mixed biotechnological–chemical strategy for the mild decontamination of exceedingly toxic nerve agent VX. Hapten will be used to raise and select monoclonal antibodies (mAbs) able to bind both the nerve agent, and an oxime, derived from pyridinaldoxime, able to specifically hydrolyze its P–S bond. In order to significantly ...