In the case of acetylformamidoxime thiosemicarbazones, the compounds (Ia-e) obtained from N-arylacetylformamidoximes (IIIa-e) and thiosemicarbazide are different from substances synthesized by the counter-flow method. Whereas the classification of amphi- isomers [4] can be given to thiosemicarbazones (IIIa-e) synthesized from arylamines and from~-isonitrosoacetone thiosemicarbazone (IV) which has an amphi-structure, ...