Chemotaxonomic analysis of Laurencia spp. collected from the coast of Akita Prefecture, Japan. Part II: chemical composition of Laurencia hamata

The constituents of the marine red alga Laurencia hamata Yamada (Kagi-sozo in Japanese), which was entangled in the brown alga Sargassum sp., collected from the coast of Oga Peninsula, Akita Prefecture, Japan were investigated. This species produced two halogenated C 15 -acetogenins, a new hamatenyne ( 2 ) and a known cis -maneonene-A ( 1 ). Their structures were deduced on the basis of spectroscopic data and comparison with previously reported data. In addition, the biological activities of the isolated compounds were evaluated against the brine shrimp assay and the DPPH antioxidant assay. This is the first report on chemistry and morphology of L. hamata . • The constituents of Laurencia hamata corrected from Akita Prefecture, Japan were investigated. • New acetogenin named hamatenyne was isolated. • Chemical and morphological characteristics of Laurencia hamata were discussed.