Plural form of hexyl; multiple hexyl chemical groups or compounds containing the six-carbon hexyl group.
From hexyl (from hex- meaning six + -yl, a chemistry suffix for alkyl groups) + -s for plural form.
When chemists talk about hexyls in a molecule, they're discussing how multiple six-carbon chains are attached—it's like building with LEGO blocks where each piece has six atoms instead of one.
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