2-NP-AHD is a 2-nitrophenyl derivative of AHD, which is a metabolite of nitrofurans, a class of antibiotics. It serves as an indicator for the detection of illicit use of nitrofuran drugs.

Atorvastatin 3-Deoxyhept-2E-Enoic Acid is an impurity of Atorvastatin, an HMG-CoA reductase inhibitor that effectively decreases blood lipids.

WR 199507 trihydrobromide 是伯氨喹代谢物的一种，其在犬红细胞裂解液中能诱导高铁血红蛋白的生成。

4-Desmethyl Istradefylline is a Istradefylline metabolite. Istradefylline is a very potent, selective, and orally active adenosine A2A receptor antagonist with Ki of 2.2 nM in experimental models of Parkinson's disease.

Prostaglandin E1 (PGE1), synthesized through cyclooxygenase-mediated metabolism of dihomo-γ-linolenic acid (DGLA), functions by inhibiting platelet aggregation (IC50= 40 nM) and enhancing vasodilation. Its analog, 13,14-dihydro-16,16-difluoro PGE1, and the metabolite, 13,14-dihydro PGE1, both retain similar anti-aggregatory properties to the original compound. The inclusion of two electron-withdrawing fluorine atoms in 13,14-dihydro-16,16-difluoro PGE1 is believed to increase molecular stability and potentially extend bioavailability by resisting hydrolytic degradation.

2,2-Dichloro-1,1-ethanediol 是杀虫剂Dichlorvos和三氯苯胺的代谢产物，并且在沙门氏菌/微粒体试验中显示出致突变性。