DESCRIPTION BU72 was reported as a long-lasting μ receptor agonist . Its very high affinity meant that it was not considered as a clinical candidate. Strong lipophilic binding interactions with the μ receptor confer slow receptor kinetics, and therefore long duration of action.
We revised the chemical structure in March 2021, based on data arising from analysis of the crystal structure of the BU72/μ receptor complex that was deposited to the Protein Data Bank (5C1M) . This shows that the (β-phenyl) group of BU72 shoud be in the (R) configuration. BU72 has been used in a number of studies to model the μ receptor activation process . (GtoPdb)