Appendix 1—chemical structure 2. tert-Butyl cis-(±)−4-(4-bromophenyl)−3-(quinolin-8-ylcarbamoyl)piperidine-1-carboxylate ((±)-S2a) and tert-butyl trans-(±)−4-(4-bromophenyl)−3-(quinolin-8-ylcarbamoyl)piperidine-1-carboxylate ((±)-S3a).
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