Historical clue formulations

• Carbon compound — 2025-09-07
• Carbon compound — 2024-10-30
• Carbon compound — 2021-11-30
• Unstable chemical compound — 2020-11-09
• Chemical compound — 2019-05-12
• Hydroxyl-bearing compound — 2018-07-20
• Hydroxyl compound — 2017-09-24
• Hydroxyl group compound [14] — 2017-09-20
• Carbon compound — 2016-12-18
• ___ ether — 2016-03-05
• Alkene derivative — 2015-06-04
• Hydroxyl-bearing compound — 2014-11-14
• Hydroxyl compound — 2014-09-21
• Unstable compound — 2014-09-19
• Hydroxyl compound — 2014-06-12
• Organic compound — 2014-06-01
• ___ ether — 2014-01-29
• Carbon compound — 2013-08-12
• Compound with a double-bonded carbon atom — 2012-11-27
• Carbon compound — 2012-10-30
• Organic compound — 2012-05-18
• Hydroxyl compound — 2012-03-27
• Hydroxyl compound — 2012-02-25
• Organic compound — 2011-08-21
• Form of pyruvic acid — 2011-05-21
• Hydroxyl compound — 2010-12-30
• Hydroxyl compound — 2010-10-28
• Organic compound — 2010-02-10
• Organic compound — 2010-01-10
• Form of acetylacetone — 2009-05-31
• Certain alkene — 2009-05-04
• Double-bonded compound — 2008-08-09
• Carbon compound — 2008-06-27
• Compound that's subject to tautomerism — 2008-06-08
• Certain alkene — 2008-04-10
• Compound with a double bond — 2008-03-22
• Certain alkene — 2008-02-16
• Hydroxyl-carbon compound — 2007-12-03
• Keto-___ tautomerism (organic chemistry topic) — 2007-04-07
• Hydroxyl compound — 2007-03-28
• Hydroxyl compund — 2007-01-14
• Organic compound — 2006-12-31
• ___ ether — 2006-06-02
• Form of ether — 2006-02-10
• Double-bonded compound — 2005-10-16
• Compound with a hydroxyl group — 2005-09-21
• Tautomeric form of vitamin C, e.g. — 2005-09-09
• Organic compound — 2005-08-28
• Hydroxyl compound — 2005-06-22
• Compound with double-bonded carbon atoms — 2005-05-29