These aspects and other aspects and embodiments are described more fully below.BRIEF DESCRIPTION OF THE DRAWINGS [0016] FIG. 1 is a graph showing the antitumor activity of compound 106 in an HCT 116 human colorectal tumor model. [0017] FIGS. 2-11 show additional data for other compounds used in the in vivo experiment described in Assay Example 2.DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [0