chemical relationship is tautomer of 2023-03-18T23:49:31Z obo:chebi#is_tautomer_of is desmotrope of Two chemicals are tautomers if they can be readily interconverted. This commonly refers to prototropy in which a hydrogen's position is changed, such as between ketones and enols. This is also often observed in heterocyclic rings, e.g., ones containing nitrogens and/or have aryl functional groups containing heteroatoms. 3-carboxy-3-mercaptopropanoate (CHEBI:38707) is tautomer of 1,2-dicarboxyethanethiolate (CHEBI:38709) because 3-carboxy-3-mercaptopropanoate is deprotonated on the carboxylic acid whereas 1,2-dicarboxyethanethiolate is deprotonated on the secondary thiol.