Comparison of the proton chemical shifts in the standard carboxylic acid metabolite M-2 and metabolite M-1
| Proton on Carbon | Proton Chemical Shift in Standard Carboxylic Acid Metabolite M-2 | Proton Chemical Shift in Metabolite M-1 |
|---|---|---|
| ppm | ||
| 4 | 7.06 | 7.09 |
| 7 and 11 | 7.51 | 7.51 |
| 8 and 10 | 7.95 | 7.96 |
| 21 and 25 | 7.41 | 7.45 |
| 22 and 24 | 8.00 | 8.10 |
Glucuronide formation causes significant shifts of the signals of the protons on C-21 and =25 and C-22 and =24.