Affinity 2 Article 2 Cyclic 2 Humans 2 Libraries 2 Ligands 2 Mass spectrometry 2 Peptide 2 Peptide Library 2 Peptides, Cyclic 2 Peptoid 2 Tandem MS/MS Tandem Mass Spectrometry 2 amino acid 2 chemistry 2 combinatorial library 2 cyclopeptide 2 drug selectivity 2 electrospray 2 enzymatic degradation 2 human 2 ligand 2 mass spectrometry 2 matrix assisted laser desorption ionization time of flight mass spectrometry 2 one bead one compound peptide library 2 peptide library 2 screening 2 tandem mass spectrometry 2 trifluoroacetic acid 2