| Position | 1 |
| Piperine [13] | ||||
| δH (mult., J in Hz) | δC | COSY | HMBC |
| δH (mult., J in Hz) | δC | |
| 1 | --- | 165.5 | --- | --- |
| --- | 165.6 |
| 2 | 6.42, d, J = 14.8 Hz | 120.1 | H3 | C1, C4 |
| 6.38, d, J = 14.7 Hz | 119.7 |
| 3 | 7.38, ddd, J = 14.3, 8.4, 1.8 Hz | 142.5 | H2, H4 | - |
| 7.36, ddd, J = 14.7, 8.3, 1.9 Hz | 142.8 |
| 4 | 6.74, m | 125.4 | H3 | C3, C1' |
| overlapping | 125.2 |
| 5 | 6.74, m | 138.2 | H3 | C3, C1', C2' |
| overlapping | 138.4 |
| 1' |
| 131.1 | - | - |
| --- | 130.9 |
| 2' | 6.96, s | 105.7 | H6' | C5, C3', C4', C6' |
| 6.93, d, J = 1.5 Hz | 105.6 |
| 3' | --- | 148.2 | - | --- |
| --- | 148.06 |
| 4' | --- | 148.1 | - | --- |
| --- | 148.09 |
| 5' | 6.76, d, J = 8.0 Hz | 108.5 | H6' | C1', C3', C4' |
| overlapping | 108.4 |
| 6' | 6.88, d, J = 8.0 Hz | 122.5 | H2', H5' | C5, C2', C4' |
| 6.84, dd, J = 6.0, 1.5 Hz | 122.5 |
| Methylenedioxy | 5.96, s | 101.3 | - | C3', C4' |
| 5.9, s | 101.2 |
| 2'' | 3.62, m | 43.3 | H3'' | --- |
| 3.48, brs | 43.3 |
| 3'' | 1.58, m | 26.8 | H2'', H4'' | C5'' |
| 1.54, m | 26.6 |
| 4'' | 1.65, m | 24.7 | H3'', H5'' | --- |
| 1.54, m | 24.5 |
| 5'' | 1.58, m | 25.7 | H4'', H6'' | C3'' |
| 1.54, m | 25.5 |
| 6'' | 3.51, m | 46.9 | H5'' |
|
| 3.57, brs | 46.9 |