| AA | amino-acids |
| Carn | carnitines |
| Carn.a | acyl-carnitines |
| NEFA | non-esterified fatty acids |
| Lyso.PC.a | acyl-lysophosphatidylcholines |
| Lyso.PC.e | alkyl-lysophosphatidylcholines |
| PC | phosphatidylcholines |
| PC.aa | diacyl-phosphatidylcholines |
| PC.ae | acyl-alkyl-phosphatidylcholines |
| PL | phospholipids |
| SM | sphingomyelins |