Note: SciFinder Classic will be retired on December 30th, 2022. Users will not need to create a new login/password for the new SciFinder-n. Users must migrate any saved alerts or answer sets from SciFinder Classic to SciFinder-n before the retirement in order to keep them.

SciFinder is the most comprehensive chemical information discovery tool of chemical information. It is used to access information in selected Chemical Abstracts Service (CAS) databases: CAPlus, CARegistry, CAREACTS, CHEMCATS, and CHEMLISTS, plus the NIH database Medline.

SciFinder requires an individual username and password. Registration information is below. If you have an account with a previous institution, you must create a new account with your UW-Madison email address.

SciFinder Classic

Note: This version will be retired by the CAS on December 30th, 2022. Users will then need to use SciFinder-n to search the Chemical Abstracts databases.


In addition to the content found in SciFinder, SciFinder-n includes relevance-ranked results, step-by-step procedures and protocols, citation mapping, biosequence searching, retrosynthetic analysis, patent landscape mapping, touch-screen enabled structure drawing and more—all accessible in a modern interface.

One-time Registration (Required)

  1. Go to SciFinder Registration.
  2. Click the Users must register and obtain a personal login and password link.
  3. Click NEXT.
  4. Enter your last/first name and email address (UW-Madison email address is required)
  5. Create your user name/password
  6. Set your security question/answer.
  7. Click REGISTER.
  8. CAS will send an e-mail message to you with instructions for completing the registration process.
  9. To complete the registration process, click the link within the e-mail from CAS.  The link will expire after 48 hours.

Browser Compatibility

Click here to see the recommended configuration for optimal performance of SciFinder. JavaScript, Java, cookies, and pop-ups must all be enabled.