title: New cyclic polyketide peroxides from okinawan marine sponge plakortis sp
abstract: Three new cyclic peroxides (2-4) have been isolated from the Okinawan marine sponge Plakortis sp., and the structures were elucidated by extensive spectroscopic analyses. The absolute stereochemistries of 2 and 3 were determined by chemical conversion, whereas that of the dioxane ring of 4 was assigned by the modified Mosher's method.
authors.affiliation: Graduate School of Pharmaceutical Sciences, Hokkaido University, Sapporo 060-0812, Japan.
authors.initials: A
authors.lastname: Fontana
authors.initials: M
authors.lastname: Ishibashi
authors.initials: H
authors.lastname: Shigemori
authors.initials: J
authors.lastname: Kobayashi