Stereoselective ring opening of dimethyl 5-aryl-2,3-dihydro-3,3 dimethyl-1-oxo-1H,5H-pyrazolo[1,2–a]pyrazole-6,7-dicarboxylates with hydrazine hydrate. Synthesis of rel-(4'R,5'S)-3-[5-aryl-3,4bis (hydrazino-carbonyl)]-4,5-dihydro-1H-pyrazol-1-yl)-3-methylbutanohydrazides

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