N-(Cbz- and Fmoc-α-aminoacyl)benzotriazoles: Stable Derivatives Enabling Peptide Coupling of Tyr, Trp, Cys, Met, and Gln with Free Amino Acids in Aqueous Media with Complete Retention of Chirality - Katritzky, Alan R; Angrish, Parul; Hür, Deniz; Suzuki, Kazuyuki (Synthesis, 2005)