... NMR: δ (ppm ): 140 .8 (C- 5), 121.72 (C- 6), 71.89 (C- 3), 56.81/56.91 (C-1 4) , 56.12/56.02 (C-1 7), 50.20 (C- 9), 45 .90/51.26 (C-2 4) , 42 .26 /42 . 34 (C -4 , C-1 3), 39.72/39.82 (C-1 2), 37.30 (C- 1), 36. 54 ... (C-1 0), 36.17 /40 .47 (C-2 0), 34. 00/138.31 (C-2 2), 31.95 (C- 8), 31.95si (C- 7), 31.95st (C-7, C-2 5), 31.70 (C- 2), 29.23si (C-2 5), 28.26/28.91 (C-1 6), 26.18/129. 34 (C-2 3), 24. 39/ 24. 33 (C-1 5), ... β-Sitosterol: (m/z ): 41 5 [M+H]+, 41 2, 41 0, 40 9, 40 7, 40 6. Phổ ESI–MS của Stigmasterol:(m/z ): 41 3[M+H]+, 41 2[M]+, 41 1, 40 9. Phổ 1H - NMR: δ (ppm ): 0.68 (3H, s, Me-1 8), 1.01 (3H, s, Me-1 9), 2...