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- 1976 -2014 1
- 1979 - 2014 1
- 1990 - 2014 1
- 1991 - 2012 1
- 1991 - 2014 1
- 1991-2000 1
- 1991-2011 1
- 1992 - 2012 1
- 1992 - 2014 1
- 1992-2014 2
- 1995 - 2014 2
- 1999 -2014 1
- 2 - acetylpyridine thiosemicarbazone 1
- 2,2,-bipyridine 1
- 2,2’-Bipyridin 1
- 2-Hyđroxynicotinat 1
- 2-hyđroxynicotinic acid 1
- 2-phenoxybenzoat 1
- 2-pyrrolidinone 5
- 20 năm 4