00403nam a2200121Ia 4500008004100000022001400041040001100055100002600066245012800092260003500220300001700255300000900272251112s9999||||xx |||||||||||||| ||und||  a0040-4039  aCNCLSA  aProf. N. K. Kochetkov 0aTetrahedron LettersbThe International Journal For the Rapid Publication of Preliminary Communications in Organic Chemistry  c1981bPergamon PressaNew York  aP. 2033-2712  bV.34