Table 1.
Precision for 1H NMR signals of xanthoxylin for proton (ppm); intraday, RSD (%); and interday, RSD (%).
| Proton (ppm) | Intraday, RSD (%) | Interday, RSD (%) |
|---|---|---|
| 4-OCH3 (3.82) | 4.43 | 2.50 |
| 6-OCH3 (3.85) | 4.42 | 2.55 |
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