Institution: | 1. Department of Organic Chemistry , Kossuth University , H-4010, Debrecen, P. O. B. 20, Hungary;2. North Hungarian Chemical Works , H-3792, Sajóbábony, Hungary;3. Department of Organic Chemistry , Kossuth University , H-4010, Debrecen, P. O. B. 20, Hungary;4. North Hungarian Chemical Works , H-3792, Sajóbábony, Hungary |