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Synthesis of 5,5-diphenylimidazolidine-2,4-dione conjugated to isatin, benzaldehyde or 3-formylindole. Reagents and conditions: (a) ethyl bromoacetate, K2CO3, acetone, reflux, 24 h; (b) N2H4, EtOH, rt, 24 h; (c) appropriate benzaldehyde or isatin, AcOH, MeOH, reflux, 6 h.
