| Compounds | R1 | R2 | R3 | R4 |
|---|---|---|---|---|
| 1 | H | OH | OH | OH |
| 2 | H | OCH3 | OCH3 | OCH3 |
| 3 | H | OCH3 | OCH3 | H |
| 4 | H | OH | OH | H |
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