Historical clue formulations

• Chemical "twin" — 2026-04-21
• Chemist's variant — 2026-01-04
• Molecule with a non-unique formula — 2025-10-22
• Molecule that shares its formula with another — 2025-02-04
• Compound with the same number of atoms in a different arrangement — 2024-12-16
• Similar chemical compound — 2022-06-06
• Compound with a chemical "twin" — 2022-02-05
• Chemical cousin — 2019-05-13
• Chemical variation — 2019-03-07
• Chemical cousin — 2016-05-04
• Chemical "twin" — 2014-04-22
• Chemistry test topic — 2013-05-10
• Compound variant — 2008-11-23
• Chemical relative — 2008-10-18
• Chemical cousin — 2008-03-30
• Chemical "twin" — 2006-06-25
• Glucose, to fructose — 2006-04-07
• Chemistry test topic — 2004-03-12
• Chemical cousin — 2001-09-03
• One of chemically related compounds — 1997-08-23
• Ethanol, to dimethyl ether — 1997-02-06
• Chemical relative — 1995-12-19
• Related compound — 1995-10-29