HR1 is a mastoid protease. HR1 can increase the permeability of human erythrocyte membrane. HR1 can induce cytoplasmic membrane permeation in bacteria and mast cells .

Boc-Gln-Ala-Arg-AMC hydrochloride is a fluorescent compound used as a substrate for trypsin and for assessing the protein hydrolysis activity of TMPRSS2.

N-Methylcorydalmine may exhibit significant anti-hypoxia activity.