A volatile alkaloid poison found in poison hemlock, similar to or a variant of coniine.
From coniine (the primary poisonous alkaloid of hemlock) with suffix -ein, a chemical nomenclature variant indicating a related or derived compound.
The various names for hemlock poisons—coniine, conicein, coniiene—reflect how 19th-century chemists didn't yet have modern tools to perfectly identify compounds, so they named variants based on subtle differences they could detect.
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