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SUMMARY The red alga Laurencia nipponica Yamada (Rhodomelaceae, Ceramiales) is known to contain several chemical races, each of which is characterized by a particular, major halogenated secondary metabolite. Both field‐collected and cultured plants of a population of this species found recently at Shikanoshima Island, Fukuoka Prefecture, southern Japan, produced C15 bromoethers, (3E)‐laureatin and (3E)‐isolaureatin, and sesquiterpenoids, 2,10‐dibromo‐3‐chloro‐9‐hydroxy‐α‐chamigrene and 2,10‐dibromo‐3‐chloro‐α‐chamigrene. Laurencia nipponica can be referred to as a further chemical race that is characterized by the production of two C15 bromoethers, (3E)‐laureatin and (3E)‐isolaureatin, and a sesquiterpenoid, 2,10‐dibromo‐3‐chloro‐9‐hydroxy‐α‐chamigrene as major compounds.
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Abe et al. (1997) studied this question.
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