Butenedioic acid may refer to either of two enantiomers:
Fumaric acid, or trans-butenedioic acid Maleic acid, or cis-butenedioic acid
Wikipedia
Butenedioic acid may refer to either of two enantiomers:
Fumaric acid, or trans-butenedioic acid Maleic acid, or cis-butenedioic acid