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(2007)(S)-3-[N-2-phenoxyethyl-[N-4-(5-phenylpent-4-yn-2-yloxy)but-2-ynyl]amino]propanenitrile
(S)-3-[N-4-(non-4-yn-2-yloxy)but-2-ynyl-N-(2-phenoxyethyl)amino]propanenitrile
(S)-3-[N-2-phenoxyethyl-[N-4-(6-phenoxyhex-4-yn-2-yloxy)but-2-ynyl]amino]propanenitrile
(R)-3-[N-4-[1-(4-methoxyphenoxy)-5-phenylpent-4-yn-2-yloxy]but-2-ynyl-N-(2-phenoxyethyl)amino]propanenitrile