UniChem
UniChem is a large-scale non-redundant database maintained by EMBL-EBI that provides cross-references between chemical structures across multiple chemistry resources. It serves as a unified system for creating and maintaining structure-based hyperlinks between chemistry databases, particularly optimized for on-the-fly link creation via REST web services. UniChem aggregates compound identifiers from major chemistry resources including ChEMBL, ChEBI, SureChEMBL, PubChem, DrugBank, and many others, enabling efficient cross-database chemical structure queries using InChI, InChIKey, or source-specific identifiers.
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