| TCA | Tricarboxylic acid |
| VIP | Variable importance in projection |
| AA | Amino acid |
| AAD | Amino acid derivative |
| BD | Benzene derivative |
| FA | Fatty acyl |
| OA | Organic acid |
| OAD | Organic acid derivative |
| CA | Carboxylic acid |
| CAD | Carboxylic acids derivative |
| GLYC | Glycerophospholipid |
| Gly/Glu | Glycolysis/Gluconeogenesis |
| ND | Nucleotide derivative |
| HC | Heterocyclic compound |
| Cys and Met | Cysteine and methionine |
| AKEs | Aldehyde, Ketones, Esters |
| CVs | CoEnzyme and vitamins |
| ALC and AMs | Alcohol and amines |
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