There are multiple definitions:

1. optical clearing agent(English)

   • DMSO, NIR, SC, TDD, TWEL, UV

2. obeticholic acid(English)

   • a CDCA derivative that activates FXR/FGF19 to inhibit CYP7A1 and bile acid synthesis
   • CDCA, FXR
   • Biliary tract
   • https://doi.org…res.2020.05.001

3. opioid-containing anesthesia(English)

   • ERAS, OFA
   • Anesthesiology/analgesia, Surgery, Spine (or spinal cord)
   • https://doi.org…19.1.FOCUS18645