In CARD, I want to use the ID of a resistance gene(e.g. AAC(6')-31, Accession: ARO:3002585) to find its related antibiotic's structure file.

In the paper, quote, 'CARD curation rules require each antibiotic in the ARO to be cross-referenced to a PubChem ID (PCID)' so I presume the CARD use PCID as a port connected to PubChem?

However, I could not find the 'PCID' number in the downloaded CARD data.(at local linux server)

How/Where to find it? Any help would be appreciated.

to understand it with the online example

1. the resistance gene: https://card.mcmaster.ca/ontology/38985
2. the resistance gene's related drug class: https://card.mcmaster.ca/ontology/35935
3. the subterm of the drug class, the antibiotic: https://card.mcmaster.ca/ontology/35922#
4. the antibiotic's structure file: https://pubchem.ncbi.nlm.nih.gov/compound/5284517#section=2D-Structure&fullscreen=true