Fig. 5. 2D HSQC NMR spectra of KL and the fractions, (A) side chain region of KL; (B) aromatic region of KL; (C) side chain region of F1; (D) aromatic region of F1; (E) side chain region of F2; (F) aromatic region of F2; (G) side chain region of F3; (H) aromatic region of F3; (I) side chain region of F4; (J) aromatic region of F4.