It is produced by the strain of Laccaria amethystea. It can inhibit the activity of antiserine protease. It inhibits trypsin, papain, thermophilic protease, collagenase and zinc protease with IC50 (μg/mL) of 10.9, 5.1, 8.4, 5.7 and 3.0, respectively. It also has a strong anti-proliferative activity against L-929, K-562 and HeLa cells with IC50 (μg/mL) of 2.4, 1.8 and 13.9, respectively.