Loxistatin Acid (formerly also known as E-64C; NSC-694279; EP-475), an analog of E-64, is a novel, potent, irreversible and membrane-permeable cysteine protease inhibitor with important biological activity.

Odanacatib (also known as MK-0822) is a potent, selective, and neutral inhibitor of cathepsin K (human/rabbit) with the potential to be used for the treatment for osteoporosis and bone metastasis.

E-64 (also known as Proteinase inhibitor E 64), a naturally occuring compound isolated from cultures of Aspergillus, is a novel, potent, irreversible and selective cysteine protease inhibitor with potential antineoplastic and antiparasitic activity.

N-Ethylmaleimide (also known as NEM) is an organic biochemical compound that is derived from maleic acid.

Leupeptin Hemisulfate (NK-381; N-acetyl-L-leucyl-L-leucyl-L-argininal) is a naturally occurring, membrane-permeable, reversible and competitive inhibitor of the serine and cysteine proteases with potential antioxidant and anti-inflammatory activity.