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 808 555
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.
Alert Line: (+49) 7247 808 777
The Alert Line is an automated service, which informs you about current system problems and database availability.
Fax: (+49) 7247 808 259
E-mail: helpdesk(at)fiz-karlsruhe.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:
Phone: (+1) 614 447 3700
Fax: (+1) 614 447 3751
E-mail: help(at)cas.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) 3 5978 3601 (Technical Service)
(+81) 3 5978 3621 (Customer Care)
Fax: (+81) 3 5978 3600
Helpdesk Page