... l-Phenyl-3-oxobutyl)-4-hydroxycoumarin (Warfarin) Prepared from Substituted Salicylic Acids Andrew 0. ObasekiT Department of Pharmaceutical Chemistry, Faculty of ... Heterocyclic Chen., 22, 529 (1985 ... I II л 0С=сссн, í_ base CHfCOjEtìJN 0*0 с,н,о1Шос,н, C = U <)н»он 9 J!oc,n ...