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note
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The absolute configuration of β-lactam 54 has previously been unambiguously determined by X-ray crystallography (Ref. 22) and the absolute configuration of other β-lactams was assigned by analogy.
-
-
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114
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77953136188
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note
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2). The absolute configurations of 58, 62 and 64 were assigned by analogy. All ee values for the minor anti-diastereoisomer were <5%, and their absolute configuration has not been assigned.
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