Experienced searchers and scientists are available to provide expert assistance free of charge. They will be happy to answer your questions about STN command language, developing effective search strategies, database content topics, questions about accessing STN and much more. There are also a number of STN Representatives around the world that offer similar support and service in your language.

Users in Europe should contact STN INTERNATIONAL - FIZ Karlsruhe at: 
Phone:  (+49) 7247 808555
If the Help Desk phones are busy, you will be automatically connected to our Voice Mail Service, where you can leave a message. We will reply as soon as possible.
Fax: (+49) 7247 808259
E-mail: helpdesk(at)fiz-karlsruhe(dot)de or feedback form
Help Desk Hours of Operation are from:
8:00 a.m. - 6.00 p.m. (CET) Monday - Friday 

Users in North America should contact STN INTERNATIONAL - CAS Customer Care at:
(+1) 8007534227 *
(+1) 6144473698
*voice menu option 2: General information or account-related questions
*voice menu option 3: Assistance with search strategies, database content, or using a product
*voice menu option 4: Assistance with software setup, installation, and configuration
E-mail: help(at)cas(dot)org
Help Desk Hours of Operation are from:
8:00 a.m. - 8.00 p.m. (U.S. Eastern Time) Monday - Friday 

Users in Japan should contact JAICI (Japan Association for International Chemical Information) STN Japan
Phone: (+81) 359783601 (Technical Service)
(+81) 359783621 (Customer Care)
Fax: (+81) 359783600
Helpdesk Page