... Chem. 1983,48,255-259 ... 620 from the Institute of Organic Chemistry. (2) A substituted example of heterocyclic system 2 has been reported in the literature: Maillard, J.; Langlois, M.; DeLaunay, P.; Vo Van, T.; Chenu, J.; Morin, R.; Benharkate, M.; Manuel, C.; Montoso, F. J. Med. ...