酮

Left wine-jug radical - pictograph of a narrow-necked liquor vessel, the indexing radical. Marks 酮 in the chemistry/fermentation family alongside 酒 (wine), 醋 (vinegar), 酸 (acid), 醇 (alcohol). All organic-chemistry terms in Chinese (ketone, ester, aldehyde) reach for 酉 because they share the underlying smell-and-distillation logic.

Right side 同 supplies the sound directly (tóng → tóng, exact match). Pure phonetic role; the 'same / together' meaning is unused here. Modern chemical names for ketones - 丙酮 (acetone), 苯酮 (benzophenone) - all stack onto this radical-phonetic frame.