Historical clue formulations

• World's most-produced organic compound — 2026-01-25
• Compound that ripens bananas — 2026-01-11
• Hydrocarbon gas — 2019-03-24
• Emission of ripening fruit — 2013-06-28
• Fruit-ripening gas — 2010-11-12
• Anesthetic gas — 2010-10-03
• Anesthetic gas — 2002-09-11
• Flammable gas — 2001-08-24
• Gas used as an anesthetic — 2001-03-11
• C2H4 — 2001-01-12