The molecular formula C6H4O3 may refer to:
- 2,5-Diformylfuran
 - 2,4-Diformylfuran
 - 3,4-Diformylfuran
 - Monohydroxybenzoquinone
- 2-Hydroxy-1,4-benzoquinone
 - 3-Hydroxy-1,2-benzoquinone
 - 4-Hydroxy-1,2-benzoquinone
 
 - 4-Cyclohexene-1,2,3-trione
 - 2,5-Oxepindione
 - 2,7-Oxepindione
 
See also
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