Table 3. 1H NMR of Isolated Compounds in Pyridine.
| 3 | 9 | 7 | 8 | |
|---|---|---|---|---|
| position | cucurbitacin E | cucurbitacin E 2-O-β-d-glucopyranoside | neocucurbitan A | neocucurbitan B |
| 1 | 6.29 d (2.8) | 6.18 brs | 6.22 s | 6.25 s |
| 6 | 5.67 dt (5.1, 2.6) | 5.75 brs | 5.68 m | 5.67 d (4.6) |
| 7 | 2.24 m | 2.34 m | 2.10 dd (20.2, 5.1) | 2.09 dd (20, 5.1) |
| 1.97 m | 2.00 m | 2.31 ddt (20.3, 8.2, 3.8) | 2.3 ddd (20.3, 8, 3.2) | |
| 8 | 2.0 d (8.5) | 2.01 m | 2.04 d (8) | 2.02 d (8) |
| 10 | 3.75 m | 3.50 brs | ||
| 12 | 3.36 d (14.7) | 3.23 bd (14.0) | 2.91 d (14.6) | 2.89 d (14.6) |
| 2.93 d (14.7) | 2.72 d (14.5) | 3.07 d (14.6) | 2.99 d (14.7) | |
| 15 | 1.93 m | 1,65 d (13,1) | 1.63 d (13.0) | |
| 1.74 m | 1,91 m | 1.89 m | ||
| 16 | 5.10 td (7.7, 4.4) | 4,99 t (8,0) | 4.92 d (9.1) | |
| 17 | 3.00 d (7.1) | 2.46 d (6.7) | 2.94 d (7.0) | 2.92 d (9.0) |
| 18 | 1.19 s | 0.94 s | 1.17 s | 1.18 s |
| 19 | 1.11 s | 1.00 s | 1.30 s | 1.30 s |
| 21 | 1.70 s | 1.41 s | 1.67 s | 1.60 s |
| 23 | 7.35 d (16) | 6.48 d (15.6) | 7.35 d (15.7) | 7.54 d (15.0) |
| 24 | 7.38 d (16) | 7.02 d (15.6) | 7.41 d (15.7) | 7.47 d (15.3) |
| 26 | 1.53 s | 1.51 s | 1.56 s | 1.42 s |
| 27 | 1.50 s | 1.54 s | 1.52 s | 1.46 s |
| 28 | 1.59 s | 1.36 s | 1.31 s | 1.23 s |
| 29 | 1.29 s | 1.26 s | 1.25 s | 1.45 s |
| 30 | 1.44 s | 1.41 s | 1.46 s | 1.25 s |
| 32 | 1.88 s | 1.99 s | 1.88 s | |
| 1′ | 4.68 d (7.6) |