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The conformation-selective IR spectroscopy of the alanine dipeptide analogue Ac-Ala-NH2, a molecule deprived of a UV chromophore, has been obtained by laser double-resonance IR/UV spectroscopy, using a UV-tag (toluene) non-covalently bound to the peptide. The Ac-Ala-NH2–toluene complex, as detected through a resonant multiphoton ionisation process, is composed of a folded peptide monomer (C7 conformation)...
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