... 4. (d); G. Toth, KC Russell, G. Landis, TH Kramer, L. Fang, R. Knapp, P. Davis, TF Burks, HI Yamamura, VJ Hruby; J. Med. Chem., 35 (1992), pp. 2383–2391 and references therein. ... 5. Liao, S.; Shenderovich, M. and Hruby, VJ unpublished results. 6. The based on NMR spectra. The 1 H NMR(CDCl 3 ) of some intermediate compounds follows: δ ppm 2Z: 11.94(s, broad, 1H, COOH ...
[Sekine, Mitsuo; Nakajima, Masashi; Kume, Akiko; Hashizume, Akio; Hata, Tsujiaki Bulletin of the Chemical Society of Japan, 1982 , vol. 55, # 1 p. 224 - 238]