Groenlandicine, a protoberberine alkaloid, is a cholinesterase inhibitor (AChE (IC50 = 0.54 μM), BChE (IC50 = 3.32 μM) ). Groenlandicine non-competitively inhibits BACE1 (IC50 = 19.68 μM, Ki = 21.2) and inhibits RLAR (IC50 = 140.1 μM), HRAR (IC50 = 154.2 μM), and total ROS generation (IC50 = 51.78 μM) in vitro. Groenlandicine suppresses osteosarcoma cell proliferation while promoting apoptosis. Groenlandicine inhibits the tumor growth when combined with Cisplatin. Groenlandicine can be used for the study on osteosarcoma, Alzheimer's disease and diabetes mellitus[2][3][4][5].