... (C -1 5), 23 .12 /25. 41 (C-2 8), 21. 12si (C -1 1) , 21. 12st (C -1 1 , C-2 1) , 19 .07 /19 .00 (C-2 7), 19 . 41 (C -1 9), 19 .82/ 21. 23 (C-2 6), 18 .80si (C-2 1) , 12 .00 /12 .24 (C-2 9), 11 .88 /12 .07 (C -1 8). Ghi ch : ... 13 C - NMR: δ (ppm ): 14 0.8 (C- 5), 12 1.72 (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) , ... (C -1 0), 36 .17 /40.47 (C-2 0), 34.00 /13 8. 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 /12 9.34 (C-2 3), 24.39/24.33 (C -1 5), ...