SciFinder-n is a research discovery tool that allows you to explore the Chemical Abstracts Service databases that contain literature from many scientific disciplines, including biomedical sciences, chemistry, engineering, materials science, agricultural science, and more. SciFinder-n includes journal and patent references and provides searchable information regarding specific chemical substances, reactions, structure and substructure searching, chemical supplier information, and a retrosynthesis planner. New users must first register for an account at this link .