ChemSpider provides several benefits to chemical vendors for depositing their data on the site free of charge, including: 1) Exposure to ChemSpider's large user base of over 5,000 chemists per day who can directly access the vendor's data and link to their website with one click. 2) Generation of predicted physicochemical properties and identifiers for deposited structures to enhance records. 3) Flexible search capabilities allowing users to search individual vendor databases or lists of databases. 4) Identification as a commercial supplier through a special icon that links users directly to the vendor's website.