The molecular formula C6H4O4 may refer to:
- Coumalic acid
 - Dihydroxybenzoquinones
- 2,3-Dihydroxy-1,4-benzoquinone
 - 2,5-Dihydroxy-1,4-benzoquinone
 - 2,6-Dihydroxy-1,4-benzoquinone
 - 3,4-Dihydroxy-1,2-benzoquinone
 - 3,5-Dihydroxy-1,2-benzoquinone
 - 3,6-Dihydroxy-1,2-benzoquinone
 - 4,5-Dihydroxy-1,2-benzoquinone
 
 - 5-Carboxyfurfuraldehyde
 - 2-Furylglyoxylic acid
 - 3-Furylglyoxylic acid
 
See also
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