The chemical composition of three Laurencia spp., Laurencia sp., L. okamurae and L. saitoi, which were collected from the Seto Inland Sea of Japan, has been examined. Laurencia sp. collected from the coast of Matoba Park, Takehara, Hiroshima Prefecture, contained a brominated chamigrane-type sesquiterpene (1), named matobol, as the main metabolite. The structure of matobol was determined as (+)-(2R,3R,6R,10S)-2,10-dibromochamigr-7(14)-en-3-ol (1). This is the first time that the optically active 1 has been isolated from Laurencia. On the other hand, L. okamurae from the coast of Ikunoshima Island, Hiroshima Prefecture, produced laurinterol (2) that is a known cyclolaurane-type sesquiterpene characteristic to this species in Japan. L. saitoi from the coast of Matoba Park contained a known bromoallenic C₁₅-acetogenin, neolaurallene (3).

三者的化学成分凹顶藻属，凹顶藻属，属okamurae和L. saitoi，这是从日本的濑户内海收集，已审查。劳伦西亚sp。从广岛县竹原市Matoba公园的海岸收集的含有主要名称为matobol的溴化Chamigrane型倍半萜烯（1）。matobol的结构确定为（+）-（2 R，3 R，6 R，10 S）-2,10-dibromochamigr-7（14）-en-3-ol（1）。这是首次将光学活性物质1与劳伦西亚。在另一方面，L. okamurae从Ikunoshima岛，广岛县，产生laurinterol（海岸2），其是一个已知cyclolaurane型倍半萜特性这一物种在日本。来自马托巴公园海岸的斋藤L. saitoi含有一种已知的溴代allenic C ₁₅ -acetogenin，neolaurallene（3）。