00393nam a2200121Ia 4500008004100000022001400041040001100055100001900066245012600085260003500211300001600246300000900262251112s9999||||xx |||||||||||||| ||und||  a0040-4039  aCNCLSA  aDr. T. Stephen 0aTetrahedron LettersbThe International Organ For the Rapid Publication of Preliminary Communications in Organic Chemistry  c1977bpergamon pressaNew York  aP. 669-1280  bV.33