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3,3¡ä-Dithiobis(propanoic dihydrazide) (6): 84%, two steps; CAS-RN 50906-77-9;21H NMR (D2O)ä4.70 (br s,5H, HOD, NH2), 2.90 [t, 2H, CH2C(O)], 2.58 (t, 2H, SCH2);mp 125-126 ¡ãC; FAB-MS (M+H+) 239.
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