2-hydroxy-3-methyl-2-butenoic acid CHEBI:132177 Chemspider:28716810 2-hydroxy-3-methylbut-2-enoic acid An alpha,beta-unsaturated monocarboxylic acid that is 3-methylbut-2-enoic acid in which the hydrogen at position 2 has been replaced by a hydroxy group. 3-methyl-2-oxobutanoic acid 3-methylbut-2-enoic acid 2-hydroxy monocarboxylic acid alpha,beta-unsaturated monocarboxylic acid