MG-101 (also known as MG101; Calpain Inhibitor I and ALLN) is a novel, cell-permeable and potent inhibitor of cysteine proteases including calpains and lysosomal cathepsins with potential antitumor activity.

MDL-28170 (Calpain Inhibitor III) is a novel potent, selective and membrane-permeable cysteine protease inhibitor of calpain that rapidly penetrates the blood-brain barrier following systemic administration. MDL-28170 also block γ-secretase.

Cathepsin Inhibitor 1 (CTS-IN-1) is a novel and potent inhibitor of Cathepsin (L, L2, S, K, B) with the potential to be used in the treatment of osteoarthritis.

Cruzain-IN-1 is a novel and potent Cruzain inhibitor.

Calpeptin (sequence: Z-Leu-nLeu-H) is a novel, potent, cell-permeable calpain inhibitor with anti-fibrotic activity.

PMSF (full name: Phenylmethanesulfonyl fluoride) is a potent and irreversible inhibitor of serine/cysteine protease (e.g. thrombin, trypsin and chymotrypsin) with potential analgesic effects.

Balicatib (also known as AAE-581) is a novel, potent and selective inhibitor of cathepsin K with 10-100 fold higher potency in cell-based enzyme occupancy assays than against cathepsin B, L, and S.

Z-FA-FMK, a control peptidic fluoromethylketone (boc-Thr-CH2F), is a novel and irreversible cysteine protease inhibitor, and also inhibits effector caspases.

PD 151746 (PD-151746) is a novel, potent, selective, and cell-permeable calpain inhibitor with important biological activity.

Aloxistatin (also known as E-64d, E-64c ethyl ester; EST, Loxistatin; NSC 694281) is a novel, potent, selective, irreversible, broad-spectrum and cell membrane-permeable cysteine protease inhibitor with anticoagulant activities.