Table 1 also revealed that, in NCI-H460 assay, all the compounds
except 4l and 4o exhibited better inhibition than DHA
(IC50 ¼ 84.53 mM), and even preferable cytotoxic activities than the
commercial anticancer drug 5-FU (IC50 ¼ 44.04 mM), with IC50 in
the range of 11.49e41.51 mM, indicating good inhibition activities of
these compounds on NCI-H460 cell line. This cytotoxic inhibition
screening results demonstrated that the introduction of thiourea aaminophosphonate
on DHA should markedly improve the antitumor
activity against NCI-H460 cell line. Among all the compounds,
compound 4d exhibited the best cytotoxicity, with IC50 of
11.49 mM.