00375nam a2200109Ia 4500008004100000040001100041100001900052245012800071260004300199300001300242300001000255251112s9999||||xx |||||||||||||| ||und||  aCNCLSA  aDr. T. Stephen 0aTetrahedron LettersbThe International Journal for the Rapid Publication of Preliminary Communications in Organic Chemistry  cJanuary 1999bPergamon PressaNew York  aP. 1-304  bV. 45