PubChem · Example Payload

Substructure Search

Search for compounds containing a benzene ring substructure using the fast substructure search endpoint.

ChemistryChemical CompoundsDrug DiscoveryBioassayLife SciencesNCBIBioinformatics

Substructure Search is an example object payload from PubChem, with 4 top-level fields. It illustrates the shape of data this provider's APIs accept or return.

Top-level fields

titledescriptionrequestresponse

Example Payload

Raw ↑
{
  "title": "Substructure Search by SMILES",
  "description": "Search for compounds containing a benzene ring substructure using the fast substructure search endpoint.",
  "request": {
    "method": "GET",
    "url": "https://pubchem.ncbi.nlm.nih.gov/rest/pug/compound/fastsubstructure/smiles/c1ccccc1/cids/JSON?MaxRecords=10",
    "headers": {
      "Accept": "application/json"
    }
  },
  "response": {
    "status": 200,
    "headers": {
      "Content-Type": "application/json"
    },
    "body": {
      "IdentifierList": {
        "CID": [241, 996, 1049, 1108, 1116, 1201, 1203, 1289, 1303, 1313],
        "Size": 10
      }
    }
  }
}

Work with this as data

Every example here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for examples

4 MCP tools reach this
  • find_examplesBrowse and filter every example in the catalog.
  • apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
  • resolveTurn a domain, URL or GitHub org into the provider it belongs to.
  • find_cohortsEvery scored population of providers in the catalog.
All 92 tools →

Call it yourself

curl for this page
This example
curl "https://apis.io/api/v1/examples/substructure-search"
All examples
curl "https://apis.io/api/v1/examples?limit=25"

Discovery needs no key. Ratings and market analysis are Pro.

Get an API key

Free tier, no form to fill in. Signing in shares your email address with us — we store it to create your key and to recognise you if you sign in with another provider. See our Privacy Policy and Terms.

A second provider on the same verified email joins the account you already have.