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bromadoline

n. An opioid analgesic.

Wikipedia
Bromadoline

Bromadoline (U-47931E) is an opioid analgesic selective for the μ-opioid receptor developed by the Upjohn company in the 1970s.The drug has a potency lying between that of codeine and morphine, being slightly stronger than pentazocine. Bromadoline is related to AH-7921 and U-47700.