Tauro-α-muricholic acid (TαMCA) is an antagonist of the farnesoid X receptor (FXR; IC50 = 28 μM) and a taurine-conjugated form of the murine-specific primary bile acid α-muricholic acid . TαMCA is common in rodents but has also been found in small amounts in human serum.

5-Hydroxyferulic acid is an important hydroxycinnamic acid compound and a metabolite in the phenylpropanoid pathway. It acts as a precursor for the biosynthesis of sinapic acid and functions as a non-esterified substrate for COMT.

1a,1b-Dihomo Prostaglandin F2α (1a,1b-dihomo PGF2α), a hypothetical product of adrenic acid in the COX pathway, is predominantly synthesized in the renal medulla, reflecting the selective distribution of adrenic acid in this region.

Sialic acids, commonly present as terminal carbohydrates on glycoconjugates, are essential for a variety of cellular functions including cell adhesion and signal recognition, as well as the formation and progression of tumors. 3-Deoxy-D-glycero-D-galacto-2-nonulosonic acid is a deaminated sialic acid that was first identified at the nonreducing ends of oligosialyl chains in rainbow trout egg glycoprotein.[1] It is thought to be a precursor for the biosynthesis of other members of the sialic acid family.[2] 3-Deoxy-D-glycero-D-galacto-2-nonulosonic acid can be used to analyze nonulosonic acid residues in polysialoglycoproteins.[1]

Dopamine 3-O-sulfate是Dopamine的磺化代谢物，主要存在于血浆中。Dopamine 3-O-sulfate也是帕金森患者L-dopa的代谢终产物。

17-Epiestriol 是雌酮的内源性代谢产物，其形成过程经由 16α-羟基雌酮中间体，随后在 C-17 位酮基发生还原。17-Epiestriol 可与雌激素受体 α 和雌激素受体 β 结合，其相对结合亲和力分别为 29 和 80（以 17β-estradiol 为参照），支持其在雌激素信号转导、代谢过程及受体选择性研究中的相关性。