Ursodeoxycholic acid-2,2,4,4-d4 是 Ursodeoxycholic acid (HY-13771) 的氘代物。Ursodeoxycholic acid 是由肠道细菌转化 (cheno) 脱氧胆酸而产生的一种次级胆汁酸，是肠道屏障完整性的关键调节因子，对脂质代谢至关重要。Ursodeoxycholic acid 作为信号分子，通过与胆汁酸激活的受体相互作用发挥作用，包括 G 蛋白偶联的胆汁酸受体 5 (TGR5, GPCR19) 和法尼酯 X 受体 (FXR)。Ursodeoxycholic acid 可用于多种肝脏和胃肠道疾病的研究。Ursodeoxycholic acid 也减少 ACE2 的表达，有助于减少 SARS-CoV-2 感染。

Lotrifen (Privaprol), an agent of non-hormonal antifertility, causes the arrest and involution of pregnancy. It acts, after the implantation of the blastocyst, directly on the product of conception, which undergoes a slow and gradual degenerative process and ends with the reabsorption or expulsion of it.

卡马西平 10,11-环氧化物是抗惊厥药卡马西平的活性代谢物。