Three new pinolidoxins called epi-, dihydro-, and epoxy-pinolidoxin (2
, 4, and 5, respectively)were isolated from Ascochyta pinodes grown on
wheat, and theirs structures were determined using spectroscopic and
chemical methods. They were characterized as 7-epi-, 5,6-dihydro-, and
5,6-epoxy-pinolidoxin, respectively. Assayed on pea and bean leaves,
epipinolidoxin and dihydropinolidoxin caused necrotic lesions, whereas
epoxypinolidoxin was inactive. Only epipinolidoxin and epoxypinolidox
in were active using the brine shrimp assay.