The experienced searchers and scientists from our help desk provide expert assistance free of charge. They will be happy to answer your questions about the STN command language, on how to develop effective search strategies,on database content topics, questions about accessing STN, and many more. There are also a number of STN representatives available around the world who 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 Center at:
(+1) 8007534227 (North America)
(+1) 6144473700 (outside North America)
Option 2 (8 a.m. - 6 p.m.): General information or account-related questions
Option 3 (8 a.m. - 8 p.m.): Assistance with search strategies, database content or using a product
Option 4 (8 a.m. - 6 p.m.): Technical 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