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The cis- and trans-3 -amino-4-methylpiperidinyl side chains were also examined in our algorithm model and found that they displaced superimposition less favorable to that of the 3-aminoethyl-pyrrolidinyl side chain. In fact, the hypothesis was proven by our biological results of new NFQs containing the cis-(3S)-amino-(4S)-methylpiperidinyl side chain and trans-(3S)-amino-(4R)-methylpiperidinyl side chain (data not shown here and a manuscript describing detail SAR of novel NFQs is currently in preparation and will be submitted to J. Med. Chem. as a full paper in the near future).
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The low yield was due to the formation of a 1,3-butadiene byproduct, which was isolated and characterized.
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