Merck Index Online - This link opens in a new window
The Merk Index is a reference source for chemical, pharmaceutical and biomedical informaiton that contains more than 10,000 monographs, 28 supplemental tables and 450 organic name reactions. Each monograph provides descriptions of more than 18,000 substances across multiple scientific disciplines including drugs for humans and animals, organic chemicals used in research and manufacturing, plants and traditional medicines, natural products, agricultural chemicals, food additives and fragrances.