A snapshot of the compound query menu of the BioMeta web interface. The top row buttons lead to the four main search domains. The JME Molecular Editor is used to draw structure queries, optionally ignoring stereochemistry. The Name box allows searches for synonyms, optionally ignoring case and punctuation ("fuzzy" matching). ID and CAS # allow searches for BioMeta ID and CAS registry number, resp. Element Count and Molecular Formula allow extensive formula queries. The External links field allows searches for KEGG accession number. Note that all text fields allow queries using wildcards, all numerical fields (Element Count, Molecular Weight, and Exact Mass) allow comparison and range queries, and all query options can be combined.