| 摘要 |
FIELD: chemistry.SUBSTANCE: present invention relates to a two-step method of producing a compound of formulain the form of a salt or zwitterion, where Rand Rare independently (C-C)cycloalkyl or (C-C)aryl and Rand Rare independently (C-C)alkyl.EFFECT: method minimises deviation in abundance ratios of diastereomers.11 cl, 3 ex |
