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Formulas which begin with C₅H₄O

All formulas are in Hill order.

• C₅H₄O (2,4-Cyclopentadiene-1-one)
• C₅H₄O^- (cyclopentadienone radical anion)
• C₅H₄OS______ (4 species)
• C₅H₄OSe (2-Selenophenecarboxaldehyde)
• C₅H₄OTe (2-Tellurophenecarboxaldehyde)
• C₅H₄O₂______ (19 species)
• C₅H₄O₃______ (11 species)