Fig. 5. Representative images obtained by phase contrast microscopy showing morphological effects of PPT–furoxan hybrids 7 and 9 on PC3 cells. Cell cultures were treated with 7 and 9 at 0.24 μM and 0.05 μM, respectively, for 1 h, 2 h, 3 h, 4 h or 24 h in the presence or absence of N-acetyl-l-cysteine (NAC) at 1 mM (scale bar = 100 μm).