BioScreening - organic compounds for screening
Directory of companies supplying compounds for screening
http://www.bioscreening.com
Directories
Organic Chemistry Resources Worldwide
Science, Chemistry, Organic, Directories - Organic Chemistry Resources Worldwide. An intuitive WWW resource guide for synthetic organic chemists.
https://www.organicworldwide.net/
Rapid Learning Center - Science and Math Visually in 24 Hours
The leading provider of rapid learning solutions for chemistry, physics, biology and math at both high school and college levels, featuring the 24-hour core tutorial series and other learning media.
http://www.rapidlearningcenter.com/