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Besides the well-established catalytic, synthetic and materials related applications of N-heterocyclic carbene (NHC) metal complexes, their use as therapeutics deserves a special attention. Many literature reports indicate that their bioactivity is superior to other organometallic compounds. The main focus of patent disclosures in this area is the elucidation of anticancer and antimicrobial activities of NHC transition metal complexes. Nonetheless, a variety of other biological activities have been reported in non-patent literature to date. Patent literature on NHC metal complexes with focus on their therapeutic applications and relationship structure-biological activity disclosed since the first issued patent (2010) up to now (2021). The information was collected from publicly available data sources (e.g. Chemical Abstracts, MedLine, Reaxys, and SciFinder). Although the first reports on biological applications of NHC metal complexes originate in 2000s, the greatest progress in this area was made only in the past decade. A growing number of patent disclosures indicates that structural design of new NHC metal complexes is crucial for their successful use in both medicine and biochemistry. In the next few years, we expect to see more stable and effective NHC metal complexes as potential therapeutic agents and perhaps in clinical trials.

N -heterocyclic carbene metal complexes as therapeutic agents: a patent review