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The 1H (A,B) and 13C (C,D) spectra of FI and FII, correlation spectroscopy(1H-1H COSY) (E) and heteronuclear multiple bond correlation (1H-13C HMBC) (F) of FI; the overlapped spectra (G) of 1H-1H COSY (gray), total correlation spectroscopy (1H-1H TOCSY)(red) and rotating frame Overhauser effect spectroscopy (1H-1H ROESY) (blue) of FII; and the overlapped spectra (H) of heteronuclear single quantum coherence (1H- 13C HSQC) (gray) and 1H- 13C HMBC (red).
