00390nam a2200109Ia 4500008004100000040001100041100001900052245012800071260005500199300001600254300001000270251112s9999||||xx |||||||||||||| ||und||  aCNCLSA  aDr. T. Stephen 0aTetrahedron LettersbThe International Journal For the Rapid Publication of Preliminary Communications in Organic Chemistry  c1983bElsevier Science Publishers B. V.aAmsterdam  aP. 625-1460  bV. 80