title: A new bromoallene-producing chemical type of the red alga Laurencia nangii masuda.
abstract: Six populations of Laurencia nangii were found to produce three bromoallenes; dihydroitomanallene B (1), itomanallene B (2) and pannosallene (3). Prior to this report, L. nangii were only known to produce C(15)-acetogenins with acetylene functionality. This could be regarded as a new chemical race of L. nangii. The compound structures were elucidated on the basis of spectroscopic analysis and comparison with those previously reported in literature. Compound 1, dihydroitomanallene B, was isolated as a new compound representing a minor variation of itomanallene B (2).
authors.affiliation: Laboratory of Natural Products Chemistry, Institute for Tropical Biology and Conservation, Universiti Malaysia Sabah, 88400 Kota Kinabalu, Sabah, Malaysia.
authors.forename: Takashi
authors.initials: T
authors.lastname: Kamada
authors.forename: Charles Santhanaraju
authors.initials: CS
authors.lastname: Vairappan
mesh_terms: D006574:Heterocyclic Compounds, 2-Ring / Q000737:chemistry / Q000378:metabolism; D044722:Laurencia / Q000737:chemistry* / Q000378:metabolism; D013057:Spectrum Analysis / Q000379:methods
chemical_list: D006574:Heterocyclic Compounds, 2-Ring; C470774:itomanallene B