The IC<sub>50sub> value of 3-epi-DON was 357 times higher than DON in a MTT bioassay.
The IC<sub>50sub> value of 3-epi-DON was 1181 times higher than that of DON in a BrdU assay.
3-epi-DON was at least 50 times less toxic than DON in B6C3F<sub>1sub> mice.