| Xanthenes | Compounds with three aromatic rings in linear arrangement with an OXYGEN in the center ... more | 5 | 27 | Details |
| Xanthine derivatives | A methyl xanthine derivative from tea with diuretic, smooth muscle relaxant, bronchial ... more | 38 | 137 | Details |
| Xanthine Oxidase Inhibitors | An xanthine oxidase inhibitor is any substance that inhibits the activity of xanthine o... more | 3 | 18 | Details |
| Xanthines and Adrenergics | Not Available | 6 | 44 | Details |
| Xanthones | A group of XANTHENES that contain a 9-keto OXYGEN. | 1 | 4 | Details |
| Xanthophylls | Oxygenated forms of carotenoids. They are usually derived from alpha and beta carotene. | 2 | 1 | Details |
| Xanthurenates | Cyclic compounds that include atoms other than carbon in their ring structure. | 2 | 3 | Details |
| Xenon Isotopes | Stable xenon atoms that have the same atomic number as the element xenon, but differ in... more | 2 | 0 | Details |
| Yellow Fever Vaccines | Not Available | 1 | 0 | Details |
| Yttrium | An element of the rare earth family of metals. It has the atomic symbol Y, atomic numbe... more | 1 | 0 | Details |
| Yttrium (90Y) Compounds | Not Available | 1 | 0 | Details |
| Yttrium Isotopes | Stable yttrium atoms that have the same atomic number as the element yttrium, but diffe... more | 1 | 0 | Details |
| Yttrium Radioisotopes | Not Available | 2 | 1 | Details |
| Zearalenone | (S-(E))-3,4,5,6,8,10-Hexahydro-14,16-dihydroxy-3-methyl-1H-2-benzoxacyclotetradecin-1,7... more | 1 | 2 | Details |
| Zinc Compounds | Inorganic compounds that contain zinc as an integral part of the molecule. | 19 | 525 | Details |
| Zingiberaceae | A plant genus. The root used in Thai cooking. Members contain CHALCONES. | 1 | 0 | Details |
| Zingiberales | This plant order includes 8 families, 66 genera, and about 1,800 species. These herbace... more | 0 | 0 | Details |
| Zirconium | Not Available | 0 | 0 | Details |
| Zopiclone and prodrugs | Not Available | 2 | 16 | Details |
| Zygophyllaceae | A plant family of the order Sapindales, subclass Rosidae, class Magnoliopsida which is ... more | 1 | 0 | Details |