Apr 3, 2020

Revised (β-phenyl) stereochemistry of ultrapotent μ opioid BU72

BioRxiv : the Preprint Server for Biology
Thomas Anthony Munro


In its crystal structure in complex with the opioid receptor (OR), the opioid BU72 exhibits extreme deviations from the expected geometry. Three of these involve the phenyl group. There is also unexplained electron density next to the benzylic carbon. Here I show that inverting the benzylic configuration fills this unexplained density and eliminates the phenyl group outliers, along with all but one of the others. I propose that this is the correct structure of BU72.

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