The molecular formula C5H4 (molar mass: 64.09 g/mol, exact mass: 64.0313 u) may refer to:
- 3-Ethynylcycloprop-1-ene
- 1,4-Pentadiyne
- Penta-1,2-dien-4-yne
- Spiropentadiene, or bowtiediene
This set index page lists chemical structure articles associated with the same molecular formula.
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