Table 2: The cytotoxic activity of some compounds against human tumor cells.

CompoundsIn vitro cytotoxicity IC50 (µg/ml)
HePG2HCT-116PC3MCF-7

5-FU
1
2>100>100
3
4
5
7a
7b>100
8
9
10
11

IC50 (µg/ml): 1–10 (very strong), 11–20 (strong), 21–50 (moderate), 51–100 (weak), and above 100 (noncytotoxic); 5-FU = 5-fluorouracil.