A fluorescent probe and antitumor agent, displays ex/em of 445/575 nm, specifically binds GC base pairs on DNA, can be used to characterize heterochromatin in plants, cytotoxic against non-small cell lung cancer and cervical cancer in vitro (IC50s = 1, 42, 60, and 40 nM for HCC44, A549, ME180, and HeLa cells, respectively), inhibits oxidative stress- and DNA damage-induced neuronal injury