1. Department of Chemistry; University of Mandalay; Bawdegone, 73rd Road Mahar Aung Myay Township 100103 Mandalay Myanmar
2. Dipartimento di Chimica and CEMEC; Università di Pavia; Via Taramelli 12 27100 Pavia Italy
3. Dipartimento di Scienze Ambientali e della Vita; Università del Piemonte Orientale; Via Bellini 25/G 15100 Alessandria Italy
4. Faculty of Pharmacy; Meijo University; 150 Yagotoyama Tempaku Nagoya 468-8503 Japan