| Literature DB >> 3235472 |
Abstract
Statistics are updated for types of substances, ring systems, and elemental composition that have been determined for the Chemical Abstracts Service Registry Structure File at different points in time. This paper reports the updated figures and in addition some new statistics and offers some comparisons to show various shifts in file characteristics.Mesh:
Year: 1988 PMID: 3235472 DOI: 10.1021/ci00060a003
Source DB: PubMed Journal: J Chem Inf Comput Sci ISSN: 0095-2338