A chemical compound formed when ethyl groups bond with amide groups, commonly found in organic chemistry and pharmaceuticals.
From ethyl (a chemical group derived from ethane) + amide (from ammonia). The term was formed as chemists developed systematic naming for organic compounds in the 19th century.
LSD is technically lysergic acid diethylamide—the 'diethylamide' part is crucial because changing that single functional group can completely alter how a drug works in the brain, showing how molecular details matter enormously in chemistry.
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