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rR data (413.1 nm, 5 mW) of (A) the aromatic complex at RT (red) and 77 K (blue), (B) 34S isotopic substitution of aromatic complex at 77 K (green), (C) deuterated version of aromatic complex at RT (violet), and (D) difference spectrum in the Fe–S region of the aromatic complex in THF at RT (black).
