For Boc-dipeptides Boc-Xaa-Gly-OH and Boc-Xaa-Pro-OH, which can be used as building blocks during Boc-SPPS, please see the product family 'Boc-Dipeptide Building Blocks' in the 'Amino Acid Derivatives' section. This family also includes short protected peptide fragments suitable for solution synthesis and preparation of enzyme substrates and inhibitors.