Table 1.
Relative energy values (kcal/mol) of the four diastereoisomer 20a–d calculated by the HF/631G* method.
| Diasteroisomer | Relative energy value (kcal/mol) |
| 20a (RRS) | 0 |
| 20b (SRS) | 1.49 |
| 20c (SSS) | 0 |
| 20d (RSS) | 4.48 |
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