CAS SciFinder-n
CAS SciFinder-n is a collection of scientific research information from CAS, a division of the American Chemical Society. Apart from reference material and information on substances, reactions, and suppliers, CAS SciFinder offers results ranked by relevance, step-by-step procedures and protocols, biosequence search, retrosynthesis search, mapping of the patent landscape, drawing on touchscreens, and much more, all available from a simple, easy-to-use interface.