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. Author manuscript; available in PMC: 2014 Jan 24.
Published in final edited form as: J Med Chem. 2010 Feb 11;53(3):1038–1047. doi: 10.1021/jm901029n

Table 2.

Best-Fit Parameters of Cytotoxic Activity of CPT and 2a–d to the Human Lung Carcinoma A549 Cellsa

drug and
prodrugs
IC50 (95% CI) Hill slope (95% CI) R 2
CPT 5.379 (4.409/6.562) −0.692(−0768/−0.617) 0.9796
2a 12.24 (10.04/14.93) −0.622 (−690/−0.555) 0.9769
2b 120.1 (94.15/153.3) −0.565 (−0.634/−0.495) 0.9594
2c 4.103 (3.226/5.218) −0.649 (−0.739/−0.560) 0.9662
2d 5.203 (4.141/6.537) −0.443 (−0.483/−0.403) 0.9734
a

IC50 is expressed in units of nM