HRESIMS. Alkaloids 1, 2 and 5 showed significant cytotoxicities against all the tested
tumor cell lines of the head and neck squamous cell carcinoma with IC50 value less than 20 μM
and antimicrobial activities against two fungi (Alternaria alternata and Phytophthora capsici).
Alkaloids 4 and 6 exhibited the activity against bacterium Staphylococcus aureus.