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Fig. 5. a in Alkaloids from Picrasma quassioides: An overview of their NMR data, biosynthetic pathways and pharmacological effects

Fig. 5. a The possible biosynthetic pathway of bis-β-carboline alkaloids. Fig. 5b The possible biosynthetic pathway of bis-β-carboline alkaloids.

Fig. 6 in Structure elucidation and absolute configuration determination of C , C and C tirucallane triterpenoids from the leaves of Picrasma quassioides (D. Don) Benn

Fig. 6. (A) The ORTEP diagram of 8a (Cu Kα). (B) Synthesis of 8a: EDCI, DMAP, CH2Cl2, r. t., 48h, 70.6%.

Fig. 4 in Structure elucidation and absolute configuration determination of C , C and C tirucallane triterpenoids from the leaves of Picrasma quassioides (D. Don) Benn

Fig. 4. Comparison of the experimental and calculated ECD spectra of 1–7 in MeOH. Spectra were calculated at the B3LYP/6–311++ G(2d,p)//B3LYP/6-31G (d) level.

Fig. 8 in Structure elucidation and absolute configuration determination of C , C and C tirucallane triterpenoids from the leaves of Picrasma quassioides (D. Don) Benn

Fig. 8. Cytotoxic activities of compounds 1–16 against two hepatocellular carcinoma cell lines. (A) Inhibition ratio of all isolates at 50.0 μM. Sora: sorafenib at 16.0 μM, positive control. (B) Compounds with inhibition ratios> 40% were screened out to treat HepG2 cells in subsequent experiments and cell viability was determined by MTT assays.

Fig. 7 in Structure elucidation and absolute configuration determination of C , C and C tirucallane triterpenoids from the leaves of Picrasma quassioides (D. Don) Benn

Fig. 7. Influence of different configurations of 23-OCH on the δ (C-23, C24, C25) and δ (H-23, H-24) values of compounds 7–10 (1 H NMR 600 MHz, 13C NMR 3 C H 150 MHz).

Fig. 2 in Alkaloids from Picrasma quassioides: An overview of their NMR data, biosynthetic pathways and pharmacological effects

Fig. 2. Structures of canthinone alkaloids isolated from P. quassioides.

Fig. 1 in Alkaloids from Picrasma quassioides: An overview of their NMR data, biosynthetic pathways and pharmacological effects

Fig. 1. Structures of β-carboline alkaloids isolated from P. quassioides.

Fig. 4 in Alkaloids from Picrasma quassioides: An overview of their NMR data, biosynthetic pathways and pharmacological effects

Fig. 4. The putative biosynthetic pathway of β-carboline and canthinone alkaloids.

Fig. 3 in Alkaloids from Picrasma quassioides: An overview of their NMR data, biosynthetic pathways and pharmacological effects

Fig. 3. Structures of alkaloid dimers isolated from P. quassioide.

Fig. 3 in Structure elucidation and absolute configuration determination of C , C and C tirucallane triterpenoids from the leaves of Picrasma quassioides (D. Don) Benn

Fig. 3. Key NOESY correlations of compounds 1–7.

Fig. 2. Key 1H–1H in Structure elucidation and absolute configuration determination of C , C and C tirucallane triterpenoids from the leaves of Picrasma quassioides (D. Don) Benn

Fig. 2. Key 1H–1H COSY and HMBC correlations of compounds 1–7.

Fig. 5 in Structure elucidation and absolute configuration determination of C , C and C tirucallane triterpenoids from the leaves of Picrasma quassioides (D. Don) Benn

Fig. 5. The ORTEP drawings of compounds 1 and 7 (Cu Kα).

Fig. 1 in Structure elucidation and absolute configuration determination of C , C and C tirucallane triterpenoids from the leaves of Picrasma quassioides (D. Don) Benn

Fig. 1. The structures of compounds 1–16.