The molecular formula C6H4O5 may refer to:
- 2,5-Furandicarboxylic acid
 - 2,4-Furandicarboxylic acid
 - 3,4-Furandicarboxylic acid
 - Trihydroxybenzoquinone
- 2,3,5-Trihydroxy-1,4-benzoquinone
 - 3,4,5-Trihydroxy-1,2-benzoquinone
 - 3,4,6-Trihydroxy-1,2-benzoquinone
 
 
See also
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