: This string is typically used as a unique identifier for a chemical compound or a specific perturbagen (a substance that interferes with biological processes).

: You will most often encounter this ID in bioinformatics pipelines, particularly those involving L1000 gene expression profiling . It identifies a specific treatment applied to cell lines to observe transcriptional changes.

: In many instances within the LINCS database, this specific internal ID maps to a compound known for its biological activity, often used in drug discovery screens. How to use this ID

If you are working with a specific dataset (like a CSV or a GCT file from a repository like GEO or CLUE.io), this feature represents a linked to: Metadata : The chemical name, SMILES string, or InChIKey.