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Lowest-energy conformations of (a) H-Pro-OH and (b) H-Pro-Pro-Asp-NH2 (7.4) calculated using MacroModel 8.0. (c) Peptide-catalyzed conjugate addition of aldehydes 7.1 into nitroolefins 7.2, which is proposed to proceed through an enamine intermediate and is assisted by judicious placement of a protic sidechain. Reproduced in part from with permission from ref. 309. Copyright 2008 Wiley.
