Merck & Co., Inc.

Over 10,000 entries on significant chemicals, drugs, and biological substances. Structural depictions are included some entries. Look up substances by name, formula, CAS registry number, or therapeutic category. Search by structure, substructure, or similarity. Information on organic name reactions is available.

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Over 10,000 entries on human and veterinary drugs, biological and natural products, agricultural chemicals, industrial and laboratory chemicals, and environmentall significant compunds.

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