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(R)-6-phenyl-4-(triphenylmethoxy)-5-hexynyl 2,2,4,4-tetramethyl-1,3-oxazolidine-3-carboxylate
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(S)-6-phenyl-4-(triphenylmethoxy)-5-hexynyl 2,2,4,4-tetramethyl-1,3-oxazolidine-3-carboxylate