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VORHERR, T., TRZECIAK, A., & BANNWARTH, W. (2009). Application of the allyloxycarbonyl protecting group for the indole of Trp in solid-phase peptide synthesis*. International Journal of Peptide and Protein Research, 48(6), 553–558. doi:10.1111/j.1399-3011.1996.tb00874.x 
10.1111/j.1399-3011.1996.tb00874.x