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The National Library of Medicine (NLM) TOXNET website was retired on December 16, 2019. Most content will remain available through other NLM databases as well as from external websites.
The TOXNET transition page provides a list of its databases and how to access their content. Please check that page and the NLM Technical Bulletin for updates.
A suggested alternative to the CPDB (Carcinogenic Potency Database) is Lhasa Carcinogenicity Database (LCDB).