00370nam a2200109Ia 4500008004100000040001100041100001900052245012800071260003700199300001400236300001000250251112s9999||||xx |||||||||||||| ||und||  aCNCLSA  aDr. T. Stephen 0aTetrahedron LettersbThe International Journal For the Rapid Publication of Preliminary Communications in Organic Chemistry  cJuly 1, 1999bElsevieraNew York  aP. 1-1463  bV. 44