Keywords: Amides; Proteasome inhibitors; Non-covalent inhibitors; Docking studiesChT-L, chymotrypsin-like; T-L, trypsin-like; PGPH, post-glutamyl peptide hydrolyzing; C-L, caspase-like; DMSO, dimethyl sulfoxide; EDC, 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide; H