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In many cases, an unknown to an investigator is actually known in the chemical literature, a reference database, or an internet resource. We refer to these types of compounds as "known unknowns." ChemSpider is a very valuable internet database of known compounds useful in the identification of these types of compounds in commercial, environmental, forensic, and natural product samples. The database contains over 26 million entries from hundreds of data sources and is provided as a free resourcedoi:10.1007/s13361-011-0265-y pmid:22069037 fatcat:dkqpc2n4sbfp3jjbv74epgdfce