Databases for Natural Products Research:
MarinLit is a natural marine products database (text and structure searchable) with some powerful and unique dereplication tools. Searchable by:
The Dictionary of Natural Products and Dictionary of Marine Natural Products provide basic data on thousands of compounds. Searchable by name/CAS, as well as biological source, property data values, and compound/organism type.
You can search for natural products information in SciFinder and Reaxys the way you would with any other organic compound: by topic searching (including isolation of, synthesis of, etc.), by substance name or structure, or by reaction.
Other good databases for searching the natural products literature: PubMed, Web of Science, and Google Scholar.