Mycosporulone [2], a novel fungal metabolite, was isolated from the or
ganic extract of Coniothyrium sporulosm culture fluids. Its purificati
on was achieved by centrifugal tlc on Si gel and its structure was ded
uced from spectral evidence to be -4-en-3-one)-spiro-(4'-methylen-5'-o
xobutanolide).