Fig. 4. 1H in A H NMR-based metabolomic approach to study the production of antimalarial compounds from Psiadia arguta leaves (pers.) voigt

Fig. 4. 1H NMR spectra (CDCl, 600 MHz) of the ethyl acetate extracts from in vitro, healthy, attacked, and elicited acclimatized plants of P. arguta. Assignments: 3 signals a (δH 0.80, H3-19 and H3-20), b (δH 0.88, H3-18), and c (δH 1.16, H3-17) are characteristic of the labdane bicyclic ring; d (δH 0.92, H3-16), e (δH 1.71, H3-16), f (δH 2.12, H3-2′), g (δH 3.69, H2-15), and h (δH 4.13, H2-15) are assigned to labda-13(E)-en-8α-ol-15-yl acetate (1); labda-8α-ol-15-yl acetate (2); labda-13(E)-ene-8αol-15-diol (3); (8R,13S)-labda-8,15-diol (4).