149986-20-9 Hydrazinecarboxamide, 2,2'-(1,4-piperazinediylbis(2-(hydroxyimino)-1-methyl-2-ethanyl-1-ylidene))bis-, dihydrochloride N,N'-Bis(1-hydroxyimino-2-oxopropyl)piperazine semicarbazone dihydrochloride