In OTL, VX was discovered in 1952 and initially intended for use as a pesticide. Its toxicity didn't go unnoticed and by 1954 research was underway to use it as a weaponized nerve agent.
My question is, would it have been possible for a German chemist to have discovered it sometime in the 1930s? And if so, would Germany have been able to produce it in militarily useful amounts, independently of whether it would actually use it? How about Japan?