Fluticasone dimer impurity，Fluticasone Propionate的一种二聚体杂质，为具有较高受体亲和力和局部活性的皮质类固醇。

Mebeverine alcohol is a metabolite of Mebeverine.

Leukotrienes (LTs) are a group of acute inflammatory mediators derived from arachidonic acid in leukocytes. The majority of these metabolites are formed through the 5-lipoxygenase (5-LO) pathway. 14,15-LTE4 is a metabolite of 14,15-LTC4 and 14,15-LTD4, an alternate class of LTs synthesized by a pathway involving the dual actions of 15- and 12-LOs on arachidonic acid via 15-HpETE and 14,15-LTA4 intermediates. These metabolites are classified as eoxins because they are formed mostly by eosinophils. Mast cells and nasal polyps can synthesize 14,15-LTC4 as well, however metabolism to 14,15-LTE4 in these cells and tissue has not been documented. 14,15-LTE4 increases vascular permeability of human endothelial cell monolayers with about 10-fold less potency than LTC4, but approximately 100-fold greater potency than histamine.

Febuxostat impurity 7 是 Febuxostat 一种杂质。Febuxostat 是选择性黄嘌呤氧化酶 (XO) 抑制剂，Ki 为 0.6 nM。

Febuxostat amide impurity 是 Febuxostat 一种杂质。Febuxostat 是选择性黄嘌呤氧化酶 (XO) 抑制剂，Ki 为 0.6 nM。

Febuxostat dicarboxylic acid impurity 是 Febuxostat 一种杂质。Febuxostat 是选择性黄嘌呤氧化酶 (XO) 抑制剂，Ki 为 0.6 nM。