A conformational comparison of cyclo-[(S
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David J.P. Hogg; Michael North; Robert B. Stokoe
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Article
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1994
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Elsevier Science
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French
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Cycle-l(S)-His-(S)-L.eu] adopts a confirmation in solution in which rhe imidazole ring is folded over the diketopiperasine ring. This is the opposite confirmation IO that deremdned for cycle-i(S)-His-(S)-Phel. and "ray explain the opposite sense of asymnaerric induction between the two catalysts. q