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Diketopiperazine 1 consisting of L ‐(γ‐guanidino‐α‐amino)butyric acid and L ‐phenylalanine was synthesized as the hydroacetate and as the hydronitrate. Its structure was confirmed by X‐ray analysis. In contrast to reports in the literature (Lipton et al.), compound 1 does not induce enantioselevtive catalysis of Strecker reactions. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)
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Becker et al. (2005) studied this question.
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