Ringdoc — the database for pharmaceutical manufacturers and researchers

The RINGDOC database of Derwent Publications Ltd. is the world's most comprehensive database covering pharmaceutical literature. RINGDOC contains over 500,000 references from 1964 to date and is searched using two indexing systems. Codeless scanning is a system of searching keywords and the Ring Code system is a unique method of searching chemical substructures and biological activities. This paper looks briefly at the history and structure of the RINGDOC database and describes methods of searching it.