PTPRC and lung adenocarcinoma: Compounds 3 and 4 showed selective inhibitory activity against protein tyrosine phosphatase CD45 with IC50 values of 8.4 and 5.6 μM, respectively, 4 also had a moderate cytotoxicity towards human lung adenocarcinoma cell line H1975 with an IC50 value of 11.0 μM, and 14, which contained an active center, -C=N+, exhibited antibacterial activity.