The CAS REGISTRY has witnessed extraordinary growth over the past few years with approximately 12,000 new substances now added daily. The REGISTRY database currently contains more than 54.9 million organic and inorganic substances--all potential candidates for matching your structure query.  

To keep pace with this ever expanding database content, the iteration limits for sample searches have been increased from 2,000 to 1 million records.  This will ensure that sample searches continue to be accurate representations of full database search results.