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Momose, T. Efficient synthesis of an enantiomeric pair pinpinidine: An illustration of organochemical carving on the rigid bridged system as the stereochemical tactics / Takefumi Momose , Takashi Nishio and Masayuki Kirihara // Tetrahedron Letters. - 1996. - Vol., 37, Issue 28. - P. 4987-4990.
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http://dx.doi.org/10.1016/0040-4039(96)00990-2