... Downloading zip file containing 3 articles... JavaScript is disabled on your browser. Please enable JavaScript to use all the features on this page. Tetrahedron Letters. Volume 28, Issue 44, 1987, Pages 5245–5248. Cover image Cover image. Synthesis of a cognition enhancing beta-lactam fused gamma-lactam. ... J. Med. Chem., 30 (1987), p. 498. ... 3; T. Aida, R. Legault, D. Dugat, T. Durst; Tet. Lett., 20 (1979), p. 4993. ...