Table 16.
Structures of compounds 255–259.
| Compound | R1 | R2 | R3 |
|---|---|---|---|
| 255 | OH | H | OH |
| 256 | OH | H | OCH3 |
| 257 | OCH3 | OH | OH |
| 258 | H | H | H |
| 259 | OCH3 | H | OCH3 |
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