TABLE 5.

Biological activity of RM derivatives

The assay conditions are described under “Experimental Procedures.”

^a IC₅₀ (μg ml⁻¹).

^b IC₅₀ (ng ml⁻¹) for IRS.

^c Cytotoxicity data reported (12).

^d IRS activity reported by Shimizu et al. (9).

^e IRS activity reported by Shimizu et al. (10).

^f NT, not tested.