BACE1 and cancer: Besides the aforementioned assays of anti-EBV and anti-HIV, some other bioactive screenings for 1 were performed, which included inhibitory activities on β-site amyloid precursor protein cleaving enzyme 1 (BACE1) (1 towards this assay with IC50 > 40 μM), inhibitory activities on NO production (1 towards this assay with IC50 > 25 μM), and cytotoxic activities against five human cancer cell lines (HL-60, SMMC-7721, A-549, MCF-7, and SW480) (1 towards all these cytotoxicity assays with IC50 > 40 μM).