| Comp. | R1 | R2 |
|---|---|---|
| 5 | α-CH3 | OH |
| 16 | α-CH3 | COOH |
| 17 | β-CH3 | COOCH3 |
| 19 | α-CH3 | COOCH3 |
| 21 | β-CH3 | COOH |
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