1. Department of Chemistry; Memorial University of Newfoundland; St. John's NL A1B 3X7 Canada
2. Department of Chemistry; University of Lethbridge; 4401 University Drive Lethbridge AB T1K 3M4 Canada
3. Institute of Organic Chemistry and Biochemistry; Academy of Sciences of the Czech Republic; Flemingovo nám. 2 166 10 Prague 6 Czech Republic
4. Department of Chemistry and Biochemistry; Wilfrid Laurier University; 75 University Avenue W. Waterloo ON N2L 3C5 Canada