化學式C3H4O（摩爾質量：56.06 g/mol，不飽和度為2）可以指：
- 丙烯醛，CAS號：107-02-8
- 環丙酮，CAS號：5009-27-8
- 丙二烯醇，CAS號：81788-96-7
- 1-Cyclopropenol or 1-hydroxy-cyclopropene, cyclo (-CH=COH-CH2-), tautomer of cyclopropanone, not synthetized
- 2-Cyclopropenol or 1-hydroxy-2-cyclopropene, cyclo (-CH=CH-CHOH-), not synthetized
- Epoxypropene or methyl-oxirene, cyclo(-C(CH3)=CH-O-), not synthetized
- Methoxy ethyne or methyl ethynyl ether, HC≡COCH3,，CAS號：6443-91-0
- Methyl ketene or 1-propen-1-one, O=C=CH-CH3,，CAS號：6004-44-0
- Methylene oxirane, -CH2-O-C(=CH2)-,，CAS號：40079-14-9
- 1-炔丙醇, CH3C≡C-OH, ，CAS號：6175-54-8
- 2-炔丙醇，CAS號：107-19-7
- 氧環丁烯, cyclo(-CH=CH-O-CH2-), ，CAS號：287-25-2
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