| 摘要 |
B2873/Abs A process for the preparation of a compound of formula (A)' or (A)'': (A)' (S,S)-isomer (A)'' (R,R)-isomer which process comprises the base treatment of a quaternary ammonium salt of a compound of formula (D): (D) wherein the NH2 and OH moieties are trans and are (R,S) or (S,R), respectively.
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