{"cited_by_count":180066,"description":"This cluster of papers focuses on the use of deuterium and tritium labeling, hydrogen isotope exchange, and catalysis in drug discovery and development. It explores applications in medicinal chemistry, metabolism studies, and the incorporation of deuterium into pharmaceutical compounds. 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local answer requires separate source review","truth_status":"Subject descriptor, not a factual answer or a demonstrated knowledge gap","reviewed_answer":null}