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(a) (i) NH2NH2·H2O, CH2Cl2, S8, EtOH, 50 °C, and 24 h; (ii) NaNO2, AcOH, 0 °C to rt, and 30 min; (b) HCl, dioxane, CH2Cl2, rt, and 2 h; (c) HCl, dioxane, MeOH, rt, and 3 h; and (d) trifluoroacetic acid (TFA), CH2Cl2, rt, and 2 h.
