Compound GI50 (μM)a  
  MCF-7 HCT-15
1a 4.23 ± 0.50 ND
2c > 5 > 5
6f 2.44 ± 0.25 ND
9d > 5 3.60± 0.06
Doxorubicin 0.024 ± 0.007 1.07 ± 0.18
Table 2: Determination of the GI50 concentration of the most active naphthalimide compounds on different human tumor cell lines.