Versatile Selective α-Carboxylic Acid Esterification of N-Protected Amino Acids and Peptides by Alcalase - Nuijens, Timo; Cusan, Claudia; Kruijtzer, John A. W.; Rijkers, Dirk T. S.; Liskamp, Rob M. J.; Quaedflieg, Peter J. L. M. (Synthesis, 2009)