Table 1.
Anatomy of the LIPID MAPS identifier (LM_ID) which encodes lipid classification within the identifier.
| Characters | Description | Example |
|---|---|---|
| 1–2 | Fixed database designation | LM |
| 3–4 | 2-letter category code | FA |
| 5–6 | 2-digit class code | 03 |
| 7–8 | 2-digit subclass code | 02 |
| 9–12a | Unique 4-character identifier within subclass | 0016 |
a
Certain lipid subclasses (e.g. prenol sesquiterpenes) contain a 4th level of classification in which case characters 9–10 define “Class level 4” and characters 11–16 define the unique identifier for that 4th level class.