C6H4O4
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