英语翻译

题目

英语翻译
A portion of the n-hexane fraction (30 g) was chromatographed
on silica gel column eluting with a gradient of nhexane-
EtOAc to afford compound 1 (756 mg).Compound
1; El-MS m/z (70 eV,tel.int.%):412 [M]+ (11.9),
397 (3.8),394 (2.8),379 (3.7),314 (100),299 (23.9),296
(16.7),281 (24.5),271 (12.6),255 (5.6),253 (5.1),229
(21.4),213 (11.5),145 (10.7),55 (25.3); IR Vmax (KBr) cm-
1:3439,2936,1626,823; 1H-NMR (400 MHz,CDCI3) 8H
(ppm):5.36 (1 H,br d,J = 5.2 Hz,H-6),5.19 (1 H,q,J =
6.7 Hz,H-28),3.53 (1 H,m,H-3),1.58 (3 H,d,J = 6.7 Hz,
H-29),1.02 (3 H,s,H-19),1.01 (3 H,br s,H-21),1.00 (3
H,d,J = 1.2 Hz,H-27),0.98 (3 H,d,J = 1.2 Hz,H-26),
0.70 (3 H,s,H-18); 13C-NMR (100 MHz,CDCI3) 8c (ppm):
146.9 (C-24),140.7 (C-5),121.6 (C-6),115.5 (C-28),71.7
(C-3),56.7 (C-14),55.7 (C-17),50.1 (C-9),42.3 (C-13),
42.2 (C-4),39.7 (C-12),37.2 (C-1),36.5 (C-10),36.4 (C-
20),35.2 (C-22),34.7 (C-25),31.8 (C-7,8),31.5 (C-2),
28.2 (C-16),25.6

答案

这个只要翻译第一句,其它的都是碎片位置,不需要翻译的.A portion of the n-hexane fraction (30 g) was chromatographedon silica gel column eluting with a gradient of nhexane-EtOAc to afford compound 1 (756 ...