Page 1. Tetrahedron Letters,Vol.28,No.32,pp 3733-3736,1987 oo40-4o39/87 $3.00 + .oo Printed in Great Britain Pergamon Journals Ltd. ... References 1. P. Lindberg, P. Nordberg, T. Alminger, A. BrandstriSm and B. Wallmark, J. Med. Chem., 1986, 29, 1327. ...