I have downloaded the file "protein chemical.links.v4.0.tsv.gz" from STITCH 4.0. From the database, the chemical identifiers are described as below:
Chemical identifiers are of the form CID123456789, where the number stands for the PubChem compound identifier of the merged compound
Here are some example of chemical identifiers in the file :
However, I can't find the result in PubChem database by inputting the identifiers I obtain from the downloaded file. Can I know what are the problems behind and how can I solve this?