Oxalic acid (ethanedioic acid)
Malonic acid (propanedioic acid)
Succinic acid (butanedioic acid)
Glutaric acid (pentanedioic acid)
Adipic acid (hexanedioic acid)
Maleic acid (cis-2-butenedioic acid)
Fumaric acid (trans-2-butenedioic acid)
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