Cathepsin inhibitor 1 is an inhibitor of Cathepsin (L, L2, S, K, B) with pIC50 of 7.9, 6.7, 6.0, 5.5 and 5.2, respectively.

5,5-Dimethyl-2,4-oxazolidinedione is a cathepsin K inhibitor, it's an anticonvulsant.

2-Cyanopyrimidine is a potent and non-selective cysteine protease cathepsin K inhibitor with an IC50 of 170 nM. 2-Cyanopyrimidine is used for osteoporos.

AZD7986 is a second generation reversible covalent, potent and selective DPP1 inhibitor potentially for the treatment of chronic obstructive pulmonary disease (COPD) with predicted human PK properties suitable for once daily human dosing.

CA 074 is an inhibitor of cathepsin B with Ki of 2 - 5 nM.

MDL28170 is a potent, selective inhibitor of calpain and cathepsin B (Ki values are 10 and 25 nM respectively) that does not inhibit trypsin-like serine proteases. MDL28170 rapidly penetrates the blood-brain barrier following systemic administration and displays neuroprotective effects in vivo.

L 006235 is a potent, reversible cathepsin K inhibitor with IC50 of 0.25 nM.

Leupeptin Hemisulfate is a reversible serine/cysteine protease inhibitor, inhibits cathepsins B, H, L, and S, calpain, and trypsin.

LY 3000328 is a highly selective and potent Cathepsin S inhibitor with IC50 of 7.7±5.85 nM and 1.67±1.17 nM for hCat S and mCat S respectively, can be used in treatment for abdominal aortic aneurysm.

Puromycin aminonucleoside is the aminonucleoside portion of the antibiotic puromycin and it is a puromycin analog which does not inhibit protein synthesis but induces apoptosis.. Puromycin aminonucleoside is a reversible inhibitor of dipeptidyl peptidase II and cytosol alanyl aminopeptidase.

Balicatib is a potent and selective inhibitor of cathepsin K ,with 10-100 fold more potent in cell-based enzyme occupancy assays than against cathepsin B, L, and S.

Odanacatib is a potent, selective, and neutral inhibitor of cathepsin K (human/rabbit) with IC50 of 0.2 nM/1 nM, and demonstrated high selectivity versus off-target cathepsin B, L, S.

CA-074 methyl ester是一种特异性的半胱氨酸蛋白酶B抑制剂，具有神经保护、抗癌和抗炎等强效生物活性。

L-Homocysteine, a homocysteine metabolite, is a homocysteine that has L configuration. L-Homocysteine induces upregulation of cathepsin V that mediates vascular endothelial inflammation in hyperhomocysteinaemia .

MG-101 is a potent inhibitor of cysteine proteases including calpain I (Ki = 190 nM), calpain II (Ki = 220 nM), cathepsin B (Ki = 150 nM), and cathepsin L (Ki = 500 pM).

E-64（蛋白酶抑制剂E 64）是一种高效的不可逆广谱半胱氨酸蛋白酶抑制剂，对木瓜蛋白酶的IC50为9 nM。

E-64d（E64d）是一种细胞可渗透、不可逆的广谱半胱氨酸蛋白酶抑制剂，对MERS-CoV具有入侵阻断作用。

Atg4B-IN-2是一种有效的Atg4B竞争性抑制剂，其Ki为3.1 μM。它还对PLA2表现出抑制活性，对Atg4B的IC50为11 μM，对PLA2为3.5 μM。Atg4B-IN-2通过自噬增强了抗雄激素耐药前列腺癌分子的抗癌活性。