A glucoside compound found in the bark of willow and other plants, used historically in medicine and as a precursor to aspirin.
From 'helix,' referring to the spiral-shelled snail, possibly because the compound was first isolated from plants associated with snail habitats, with suffix '-in' denoting a chemical compound.
Helicin was the original source of salicylic acid—ancient people chewed willow bark for pain relief, and helicin is what made it work, eventually leading to the discovery of aspirin in the 1890s!
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