Leupeptin hemisulfate is a protease inhibitor with cell membrane-permeable, reversible, competitive, and oral activities. Leupeptin hemisulfate inhibits the activity of Cathepsin B, Cathepsin H, and Cathepsin L, and blocks fusion of amphipathic lysosomes. Leupeptin hemisulfate also has anti-inflammatory activity.

Angiotensin II human (Ang II) is a biologically active peptide, a vasoconstrictor. Angiotensin II interacts with AT1R and AT2R to regulate blood pressure, stimulate sympathetic nerves, and increase aldosterone biosynthesis and renal activity in humans.

Aureobasidin A is a cyclic peptide and an antifungal antibiotic. Aureobasidin A is an inhibitor of the inositolphosphorylceramide synthase AUR1.

Bestatin hydrochloride (Ubenimex hydrochloride) is an inhibitor of aminopeptidase N (APN) CD13 and aminopeptidase B.

Segetalin B is a natural product from Vaccaria segetalis (Neck.) Garcke, has estrogen-like activity.