U-47700 is a structural isomer of the earlier opioid AH-7921and the result of a great deal of work elucidating the quantitative structure–activity relationship of the scaffold. Upjohn looked for the key moieties which gave the greatest activityand posted over a dozen patents on related compounds...
Identification and structure characterization of five synthetic opioids: 3,4-methylenedioxy-U-47700,o-methyl-acetylfentanyl, 2-thiophenefentanyl, benzoylfe... Purpose The number of new synthetic opioids, especially fentanyl analogs, on the illicit market is increasing each year and becoming a disturbing...