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The formula is given together with their atom numbering scheme; R3, R4, R5 = Cl, H, H (3-chloro-7-azaindole (3Claza), involved in complex 1); Br, H, H (3-bromo-7-azaindole (3Braza), 2); I, H, H (3-iodo-7-azaidole (3Iaza), 3); H, Cl, H (4-chloro-7-azaindole (4Claza), 4); H, Br, H (4-bromo-7-azaindole (4Braza), 5); and H, H, Br (5-bromo-7-azaindole (5Braza), 6).
