C5H4O
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The molecular formula C5H4O (molar mass: 80.08 g/mol, exact mass: 80.0262 u) may refer to:
- Cyclopentadienone
- 1,4-Pentadiyn-3-ol[Wikidata]
- 2,4-Pentadiyn-1-ol[Wikidata]
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