PubMed was developed by the National Center for Biotechnology Information (NCBI). It was developed in conjunction with publishers of biomedical literature as a search tool for accessing literature citations and linking to full-text journals at web sites of participating publishers.
Reaxys is a web-based search and retrieval system for chemical information, including property data of chemical compounds, bibliographic data and chemical reactions. Interface to and content of the databases of Beilstein (commonly known as Crossfire Beilstein) and Gmelin.
Online version of Chemical Abstracts database includes citations to journal articles, patents, conference proceedings, dissertations, books, reviews, and technical reports. Requires use of Internet Explorer or Safari web browsers.