1: 74 percent / 95percent hydrazine hydrate / methanol / 72 h / Heating 2: 4 h / Heating 3: 1N HCl / trifluoroacetic acid / 0.33 h / 60 - 65 °C 4: sodium dithionite / dimethylformamide; H2O / 2 h / 60 - 65 °C 5: 0.1 N NaOH, / acetonitrile / 18 h / 25 °C 6: MeOH, 5percent KMnO4 / acetonitrile / 0.5 h / 25 °C View Scheme