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OpenAPI Specification

openapi: 3.2.0
info:
  title: RSC ChemSpider Compounds Filter Lookups API
  description: The RSC ChemSpider Compounds API provides programmatic access to the ChemSpider chemical database, which contains over 88 million unique chemical compounds. The API supports compound searching by name, SMILES, InChI, InChIKey, molecular formula, mass, and elemental composition. Authenticated users can retrieve compound records with detailed properties, fetch external references, images, and MOL files, and perform batch operations. A tools endpoint supports chemical format conversions and InChIKey validation. All requests require an API key obtained from the RSC Developer Portal.
  version: '1'
  contact:
    name: RSC Developer Support
    url: https://developer.rsc.org/
  termsOfService: https://www.rsc.org/legal/
servers:
- url: https://api.rsc.org/compounds/v1
  description: ChemSpider Production API
tags:
- name: Lookups
  description: Look up reference data such as available data sources.
paths:
  /lookups/datasources:
    get:
      operationId: getDataSources
      summary: Get Available Data Sources
      description: Retrieve the list of data sources available in ChemSpider. Use these names when filtering compound searches by data source.
      tags:
      - Lookups
      responses:
        '200':
          description: List of available data sources
          content:
            application/json:
              schema:
                type: array
                items:
                  type: string
        '401':
          description: Unauthorized
      security:
      - apiKeyAuth: []
components:
  securitySchemes:
    apiKeyAuth:
      type: apiKey
      in: header
      name: apikey
      description: API key obtained from the RSC Developer Portal at developer.rsc.org. Register and create an application to receive an API key.