Figure 4
![Figure 4](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs40538-014-0024-y/MediaObjects/40538_2014_Article_24_Fig4_HTML.jpg)
Aromatic region of 1H- 1H TOCSY and 1H- 13C HSQC 2D NMR spectra. Aromatic region of 1H-1H TOCSY (A) and 1H-13C HSQC (B) 2D NMR spectra of size fraction sample F5.
Aromatic region of 1H- 1H TOCSY and 1H- 13C HSQC 2D NMR spectra. Aromatic region of 1H-1H TOCSY (A) and 1H-13C HSQC (B) 2D NMR spectra of size fraction sample F5.