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The 1H (A,B) and 13C (C,D) spectra of FIII and FIV, 1H–1H COSY (E) and ROESY (F) of FIII; the overlapped 1H–1H COSY (gray), TOCSY (red) and ROESY (blue) spectra (G) of FIV; and the overlapped 1H-13C HSQC (gray) and 1H-13C HMBC (red) spectra (H).
