Synthesis and biological evaluation of 14‐alkoxymorphinans. Part 7. 14,14′‐dimethoxy analogues of norbinaltorphimine: Synthesis and determination of their χ opioid antagonist selectivityHelmut Schmidhammer, Colin F. C. Smith, Ernst Ganglbauer et al.|Helvetica Chimica Acta|1990Cited by 8