congener

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The first [five] percent of the run, aka the foreshots or heads, contains large amounts of cogeners, or volatile chemical compounds such as acetone, aldehydes, esters, and fusel oils.
Induction of larval abalone settlement and metamorphosis by gammaaminobutyric acid and its cogeners from crustose red algae: II.
The authors conclude that endocrine-disrupting effects of PBDE cogeners and metabolites operate through multiple nuclear hormone receptors and that metabolites may have stronger effects than parent compounds.