Abstract
The solvatochromic IR responsivity of small side chain –NCS in two unexplored unnatural amino acids, isothiocyanyl alanine (NCSAla = Ita) and lysine (NCSLys = Itl), without perturbing the conformation is demonstrated in two designed short tripeptide (BocAla-NCSAla-Ala-OMe) and hexapeptide (BocLeu-Val-Phe-Phe-NCSLys-Gly-OMe). Demonstration of site specific fluorescent labeling in both the peptides and ligation type reaction in NCSLys indicates the novelty of these two amino acids as alternative to the available canonical amino acids.
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