Fexofenadine Impurity F 是 Fexofenadine 的杂质。 Fexofenadine 是一种H1R 拮抗剂，可用于研究季节性过敏性鼻炎和慢性特发性荨麻疹。

(±)13,14-DiHDoTrE ((±)13,14-DHDT)是一种氧化脂质，来源于Adrenic acid代谢过程。

Loxoprofenol-SRS 是 Loxoprofen 活性代谢物，是可静脉注射的非甾醇抗炎药。Loxoprofenol-SRS 具有很好的抗炎和缓解疼痛活性。

β-Apooxytetracycline is a potential impurity found in commercial preparations of oxytetracycline. β-Apooxytetracycline is a degradation product formed from oxytetracycline via acid hydrolysis. It has a relative potency of 0.1 compared with oxytetracycline for inhibiting the growth of aerobic sludge bacteria, an MIC50 value of 32 mg/L for tetracycline-sensitive strains of Pseudomonas, and MIC50 values of greater than 32 mg/L for tetracycline-sensitive strains of Agrobacterium, Moraxella, and Bacillus, as well as tetracycline-resistant strains of E. coli. β-Apooxytetracycline (10 mg/kg) is toxic to rats, decreasing body weight, disrupting blood cell counts, and inducing hepatocyte necrosis.

Cholic acid3-sulfate sodium是Cholic acid的一种代谢产物，属于初级胆汁酸。

Hercynine (Histidine-betaine) 是 Ergothioneine 的中间体 (前体) 和氧化还原代谢物，存在于细叶藻、酿酒裂糖菌和蜜蜂中。Hercynine 对 •OH 自由基无清除作用。