| Member | Definition | Role |
|---|
| 4-hydroxymandelic acid | A 2-hydroxy carboxylic acid that is mandelic acid bearing a phenolic hydroxy substituent at position 4. | 4-hydroxymandelic acid |
| 4-hydroxyphenyllactic acid | A 2-hydroxy carboxylic acid that is lactic acid in which one of the methyl hydrogens is substituted by a 4-hydroxyphenyl group. | 3-(4-hydroxyphenyl)lactic acid |
| alpha-isopropylmalate | A dicarboxylic acid that is malic acid (2-hydroxysuccinic acid) in which the hydrogen at position 2 is substituted by an isopropyl group. | 2-isopropylmalic acid |
| schizokinen | A hydroxamic acid resulting from the formal condensation of the primary amino group of N-(3-aminopropyl)-N-hydroxyacetamide (2 mol eq.) with the carboxy groups at positions 1 and 3 of citric acid. It is a siderophore produced by Bacillus megaterium and Anabaena species. | schizokinen |