Amanita virosa Heterocyclopeptides 2 Phencyclopeptines 2 Proline-rich Cyclic peptides 2 X ray crystallography 2 ab initio calculation 2 antamanide 2 colistin 2 cyclization 2 cycloleonurinin 2 cyclolinopeptide A 2 cyclolinopeptide B 2 cyclolinopeptide C 2 cyclolinopeptide D 2 cyclolinopeptide K 2 cyclopeptide 2 cyclosporin A 2 cyclosporin B 2 drug classification 2 drug conformation 2 drug determination 2 drug hydrolysis 2 drug mechanism 2 drug structure 2 electrospray mass spectrometry 2 franganine 2 human 2 hydrogen bond 2 hydrophobicity 2 ion cyclotron resonance mass spectrometry 2