The story
Blend of (tert-)butyl + cyprenorphine.
Etymology from Wiktionary, CC BY-SA 4.0.
buprenorphine
Today it means: A semisynthetic narcotic analgesic that is administered in the form of its hydrochloride C₂₉H₄₁NO₄·HCl to control moderate to severe pain and treat opioid dependence. Full definition →