Appendix 1—chemical structure 3. tert-Butyl (+)-(3R,4R)−4-(4-bromophenyl)−3-(quinolin-8-ylcarbamoyl)piperidine-1-carboxylate ((+)−6a) and tert-butyl (–)-(3R,4S)−4-(4-bromophenyl)−3-(quinolin-8-ylcarbamoyl)piperidine-1-carboxylate ((–)-S3a).
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